Metric 123 Blocks
Matched pair of 25 x 50 x 75mm blocks.
Each block is precision ground on all surfaces.
Case hardened to HRC 55-60.
Squareness on all sides to within 0.0002" per inch.
Features 23 holes: 5 are tapped 3/8 UNC, the other 18 are untapped thru holes 8.9mm diameter.
Part Number 123-M