123 Block Set Metric with 3/8 UNC Tapped Holes

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