Set Up Blocks - Precision Machinist's 1-2-3 , 2 Block
Made Of Rugged Steel, These Precision Blocks Will Do The Job For You, Accurately. Set Of Identical Two 3" X 2" X 1" With 23 Holes.Supplied In Matched PairPrecision Ground & Case HardenedHeat Treated To Hrc 55-60For Precision Layout & Setup WorkParallel: 0.0001" - 0.0002"