The BRDE gas block drilling jig YHM is used to drill the YHM, 0.750" bore gas blocks for pinning. This jig is machined to fit the current YHM block with flat sides. Older YHM blocks with round sides fits the 2D jig.
Cold rolled carbon steel
Waterjet and hand fit opening
Manganese Phosphate finish
#31 hardened drilling insert on one side
Includes 1/4"-28tpi x 3/8" soft point set screw
Includes one #31 jobber drill bit and 1/8" hex key