Accuracy: Overall size is within +/- .0003; flatness and parallelism on all 6 sides within .0001/1.
Material: Made of precision-grade tool steel hardened and ground on all sides of block, heat treated and case hardened to HRC 55-62.
Strength: 23 holes include (5) 3/8-16 threaded hole clamping and (18) non-threaded hole. The cross-drilling design allows for effecient use of lower weight with maximum strength.
Uses: Used for set-up, layout and inspection jobs.