Content - Matched pair 1-2-3 blocks includes 2 blocks.
Strong And Sturdy - Made of precision-grade tool steel hardened and precise ground on all 6 sides of block, heat treated and case hardened to HRC 58-60.
Precise - Accuracy with squareness on all sides within 0.0001 per inch.
Feature - Cross drilling design gives minimum weight and maximum strength.
Consists of 5 tapped holes 5/16 - 18 for clamping and 6 untapped holes drilled through cross drilling design allows for efficient use of lower weight with maximum strength.