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• Ideal for precision layout & setup
• Each set consists of a matched pair of 1 2 3 blocks, five 3/8-16 stainless steel socket head cap screws, hex key, and shop-hard-molded case
• Each block precision ground on all six surfaces
• Case hardened (HRC 55 60)
• Surface finish from 6 to 16 microinches
• Squareness on all sides to within .0001
• 23 holes: 5 tapped 3/8-16; 18 untapped thru holes
• The cross drilling is designed to give minimum weight yet maximum strength
• Oversized to allow for nominal .0001 .0003