The EGW Black Stainless Steel Mini Muzzle Brake is precision-engineered for .45 caliber firearms with .456 inch bore diameter and 1/2-28 threading.EGW (Evolution Gun Works) Mini Muzzle BrakeBlack stainless steel construction for durability and corrosion resistance.45 caliber compatibility with .456 inch bore1/2-28 thread pitch for secure attachmentCompact mini design for reduced lengthDesigned to reduce muzzle rise and recoil for improved accuracy and faster follow-up shots on compatible .45 caliber firearms.