Features:Bergara ST1 (Self Timing) Muzzle Brake - .30 CaliberThe ST1 employs an angled baffle design that applies downward pressure while not venting gas into the line of sight or increasing ground disturbance. This results in a drastic reduction of felt recoil as well as minimal muzzle riseSpecifications: 5/8X24 THREAD PITCH BEST-IN-CLASS RECOIL AND MUZZLE RISE MITIGATION 17-4 GRADE STAINLESS STEEL WITH NITRIDE FINISH INCLUDES WRENCH AND BUBBLE LEVEL Length 2.500" Diameter 1.00" Locking Nut Diameter 1.10">