Suburban Tool Precision Tri-Blocks, Toolroom Grade, 3″L x 2″W x 1″H – 9151-1

• Made of steel, carburized and hardened to Rockwell “C” 58-60.
• Precision ground on all six sides to a uniform 8 micro inch finish or better.
• Because of the unusually close tolerances, you need only order Inspection Grade, where matched sets are required.
• Made in the U.S.A.