Top 10 Best 1 2 3 blocks in 2026

Last Updated - 6/7/2026

🏆Best Choice

Mega Brands

MEGA BLOKS First Builders Toddler Blocks Toys Set, Big Building Bag with 80 Pieces and Storage, Blue, Ages 1+ Years

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•The No. 1 Global Jr. Building Set (Excludes China): for preschoolers ages 1+ to build big fun
•Perfect Fit for Little Hands: Easy to grip, stack and pull apart, our blocks are designed for little hands
•First Blocks in Home: Features 60 blocks in 10 shapes and 9 vibrant colors
•Creative Learning Play: Big blocks help to develop creativity, imagination and fine motor skills
•Grow with MEGA BLOKS: Combine our building toys to level the stacking fun

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$17.24

$24.99

-31%

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Jecoupoon

Jecoupoon 123 Blocks Matched Pair 23 Holes .0002 Precision Ground Machinist Set Up Blocks HRC 55-62 (1-2-3" Blocks 0.0001" Set)

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•1.Overall size is within +/- .0003; Flatness and parallelism within .0003.
•2.Made of precision-grade tool steel hardened and ground on all 6 sides of block, heat treated and case hardened to HRC 57-62.
•3.Accuracy and squareness on all sides within 0.0003.
•4.Matched pair blocks includes 2 blocks.

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$22.35

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Nakkaa

Nakkaa 1-2-3 Blocks Set Matched Pair 23 Holes .0002" Squareness Hardened Steel Setup Blocks Ultra Precision Machinist 1"x2"x3" Blocks for Machinist Woodwork Metalwork (23 Holes)

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Feature: 23 holes include 5 holes tapped to 3/8-16 and others untapped, cross drilling design allows for efficient use of lower weight with maximum strength.
•Accuracy: Squareness: 0.0003"; Parallelism: +/- 0.0002"; Height accuracy in pair: +/-.0002".
•Material]: Made of precision-grade tool stainless steel hardened and ground on all 6 sides of block, heat treated and case hardened to HRC 56-62.
•Application: Perfect for machinists, woodworkers, metalworkers, and more.
•Package Includes: 1 * matched pair 1-2-3 blocks.

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$17.76

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Yunnergo

Yunnergo Pair of Ultra-Precision 1 x 2 x 3-Inch Parallel Blocks Set 23 Holes 0.0001 Precision with Case&Screws

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Material: Made of high quality steel, hard and hard wearing, not easy to wear and tear, long time to use.
•Accuracy: 0.0001 precision for 23 holes.
•Product includes:A pair of ultra-precision 23-hole parallel block set, 5 hexagonal screws and a hexagonal wrench with plastic case.
•Application:Great for machinists, woodworkers, metalworkers and more.
•Note: If you have any questions, please feel free to contact us.

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$19.85

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findmall

findmall 1 x 2 x 3 Inch Blocks 0.0001 Accuracy 1 x 2 x 3 Blocks Set 23 Hole with Screws Hex Key Plastic Case

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Blocks - 23 holes with 5 holes tap to 3/8-16 threads for clamping and 18 untapped holes.
•Material - Made of hardened tool steel and accuracy ground on all six sides; Heat treat and hardness 56 to 60 RC.
•Accuracy - Size within +/- .0001; Flatness and parallelism within .0001; Squareness on all sides is 0.0003 per inch.
•Feature - Cross drilling design allows efficient use of lower weight with maximum strength.
•Application - Used for set-up, layout and inspection jobs.

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$19.97

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Nakkaa

Nakkaa Ultra Precision 1-2-3 Blocks Set with Screw Matched Pair 23 Holes .0001" Squareness Hardened Steel 1"x2"x3" Blocks Set Setup Blocks Industrial Tools w/Plastic Case

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Feature: 23 holes include 5 holes tapped to 3/8-16 and others untapped, cross drilling design allows for efficient use of lower weight with maximum strength.
•Accuracy: Squareness: 0.0001"; Parallelism: +/- 0.0001"; Height accuracy in pair: +/-.0001".
•Material]: Made of precision-grade tool stainless steel hardened and ground on all 6 sides of block, heat treated and case hardened to HRC 56-60.
•Application: Perfect for machinists, woodworkers, metalworkers, and more.
•Package Includes: 1 * matched pair 1-2-3 blocks; 5 * stainless steel socket head cap screws; 1 * hex key; 1 * fitted plastic case.

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$23.77

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Aspaton

Aspaton Pair of 123 Blocks Set with Screw 23 Holes 1/10,000th Precision with Case

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Accuracy: high precision, the parallel block is a piece with 23 holes 1 x2 x3 inches precision in one in ten thousand.
•Quality: made of high quality steel, high hardness, not easy to deform, not easy to wear, durable.
•Operation: easy to operate, easy to use.
•Product includes: a pair of 23 holes 1 x2 x3 inches parallel block set, 5 hexagonal screws and a hexagonal wrench.
•Note: Please confirm the precision when you buy to avoid buying the wrong one, so as not to delay your time.

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$23.13

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WEN

WEN 10423 3 x 2 x 1-Inch Steel-Hardened Precision 123 Blocks, Two Pack

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Perfect for machinists, woodworkers, metalworkers, and more
•Each block measures 3 by 2 by 1 inches in size
•Features 5 threaded 3/8-16 UNC cross-drilled holes
•Calibrate equipment, space workpieces, or collect exact measurements
•Includes a set of two 1-2-3 blocks

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$18.71

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WFLNHB

WFLNHB 1 Matched Pair Accuracy 1 x 2 x 3 Inch Blocks 23 Holes 0.0002" Machinist 1-2-3 Set

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Product Dimensions: 1" x 2" x 3", 2.1 lbs. weight
•23 holes consists of 5 tapped holes that are 3/8-16 for clamping and 18 untapped holes
•Accuracy with squareness on all sides within .0002" per inch
•Hardened and accuracy Ground on all 6 sides of each block
•Cross drilling design gives minimum weight and maximum strength

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$17.99

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1-2-3 Blocks

123 Blocks Attachment Hardware Kit

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Many inexpensive 123 Blocks contain numerous holes allowing them to be bolted together to increase their usefulness. Several problems arise when attempting to join several blocks together: 1) the holes in the sides and faces are not the same distance from the edge and when different faces are bolted together these are steps or offsets, and 2) using readily available bolts and nuts will leave hardware proud of the block’s surface interfering with the task at hand.
•This 123 Block Attachment Hardware Kits addresses the above bolting limitations. This hardware allows joining blocks together with all hardware buried within the blocks. The hardware is also slightly smaller than the holes allowing edges and faces to be joined together with faces being flush with each other.
•This hardware kits contains the following parts: two each 7/8 inch long by 5/16 inch diameter 8-32 threads dowels, two each 7/8 inch long by 5/16 inch diameter through hole dowels that fit 8-32 bolts, two each of the following length 8-32 Allen Head Cap Screws 1-1/2 inch, 2 inch and 2-1/2 inch, 9/64 inch hex key and a small flat screwdriver tip.
•To use, insert a through hole dowel into a block hole and thread a screw through the hole. Next insert a threaded dowel into a hole in another block and screw and tighten the screw t into this nut to secure two blocks together. Each dowel has a straight screwdriver slot in line with the hole to assist in getting the dowels perfectly lined up to accept the bolts. A small straight slot screwdriver can be inserted in the slot to help in getting the dowels lined up to accept screws.
•Using this hardware allows two blocks to be attached to each other in literally every possible configuration. Comes in telescoping plastic storage tube. Patent pending.
•Patent Pending

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$16.99

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