Precise 81 Piece Precision Gage Block Sets

• Highest degree of accuracy when used at a temperature of 68°F (20°C).
• Each block serialized, regardless of the grade, for identification when block is re-calibrated and certified at a later date.
• Alloy steel with Rockwell hardness of 65.
• Sets are calibrated to meet or exceed federal specifications GGG-G-15C.

Grade A+
Supplied with a certificate of calibration traceable to NIST.

Grade "B"
Supplied with a certificate of accuracy only.