6-position dimpling jig is designed to allow you to easily dimple your
own barrel. The 6 different, laser-marked spacing sets allow for a
variety of gas blocks to be used. The jig will fit perfectly in any
bench vise to allow easy dimpling. Spacing is to the center of the
holes: .400, .420, .450, .460, .470, and .500. Made from steel heat treated material. Comes with:(1) Alignment set screw(1) Non-marring set screw
NOT Included: 5/32" Drill Bit/Spot Drill needed for cutting the dimples.