Precision 123 Blocks Set
Matched pair of 1" x 2" x 3" blocks.
Each block is precision ground on all surfaces.
Case hardened to HRC 55-60.
Surface finish from 6 to 16 microinches.
Squareness on all sides to within 0.0001" per inch.
Features 23 holes: 5 are tapped 3/8-16" the other 18 are untapped thru holes.
Supplied in fitted plastic case.
Part Number 123-PP