Shars Tool 81 Piece Steel Precision Gage Block Set with Nist Traceable Certificate: .1001" to .1009", .101 to .149", .05" to .95",1";2"
Surface hardened to 64 HRC; Meets or exceeds Federal GGG-G-15C; Included NIST traceable certificate; Grade 3; Higher degree of accuracy when used at perature of 68F (20C); Individual serial numbers on each block, regardless of grade; A complete certificate of calibration traceable to the N.I.S.T. showing the deviation of each block; All sets are supplied in deluxe fitted wood case; All sets meet or exceed Fed. Spec. ASME B89.1.9-2002; Mirror polished surfaces provide superior wringing characteristics.