0.300" center to center on holes, designed to work with LANTAC and gas blocks with 0.750 bore and 0.300" spaced holes, can also be used on 0.625 pencil barrels with use of adapter sleeve. Can also be used with most gas blocks since the location under the gas port is always the same.
1045 carbon steel
Drilling side heat treated
Media blasted and Manganese Phosphate finish
Includes pointed and soft point set screws
11/64" drilling holes
BONUS: When buying from BRDE, the jig includes a 11/64" HSS jobber drill bit and a 3/32" hex key.