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