Precise 81 Piece Square Steel Gage Block Sets

• Each block has a threaded center hole.
• Made of the highest quality tool steel.
• Surface hardness is HRC 64.
• Meets or exceeds U.S. Federal specification GGG – G – 15C.
• Complete with manufacturer’s calibration or certification that is not NIST traceable.
• Supplied in a sturdy fitted wooden case.

9 blocks.1001-.1009″ with a step of .0001″
49 blocks: .101-.149″ with a step of .001″
19 block: .050-.950″ with a step of .050″
4 blocks: 1.000-4.00″ with a step of 1.000″