Easy to use; Saf-T-blok holds the bolt steady after you thread it in to the required depth. You then drill the hole through the center with no risk of misalignment.
Standard:(6 Thread Size)
1/4, 5/16, 3/8 USS & SAE
Metric:(5 Thread Size)
6x1, 8x10, 8x1.25, 10x1.25, 10x1.5
Aero:(5 Thread Size)
8-32,10-32, .25x20, .25x28,
5/16 x 24
