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