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

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.