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

This matched pair of blocks is ground to tolerances of .0001". 23 holes, 5 tapped 3/8"-16 TPI and 18 plain

Precision ground and case hardened on all six sides

Squareness of all sides is within .0002 per inch.

Used for set-up, layout and inspection jobs

23 Holes 1 x2 x3 inches precision in one in ten thousand

High hardness, not easy to deform, not easy to wear, durable

Easy to use

A pair of 23 holes 1 x2 x3 inches parallel block set

Precision ground and case hardened on all six sides