Brown & Sharpe Ultra Precision Ground 1-2-3 Block Sets
599-750-10

• Supplied in custom molded case. Ideal for precision layout and setup.
• Each block is ground and case hardened on all six surfaces 
• Surface finish 6 to 16 micro inches 
• Squareness on all sides to .0001" 
• 23 holes: 5 tapped 3/8-16 
• Oversized to allow for normal tapping .0001" - .0003" 
• Case hardened to 50-60 HRC 
• Set consists of pair of 1x2x3 inch blocks, five 3/8-16 stainless steel socket head cap screws and a hex key wrench