Block, 3" dia., 3" L, Insize, Mfr#: 6531-5

Tri-Block, Length 1 in, Width 2 in, Height 3 in, Number of Holes 23, Number of Blocks Matched Pair, Size 1 in L x 2 in W x 3 in H, Hardness HRC 55-62, Hole Style 3/8-16 in Tapped, Includes Screw, Wrench, Includes Case No, Squareness 0.0001 in per 1 in, Parallelism 0.002 in, Tolerance +/-0.0002 in, With Holes Yes