This Mini Muzzle Brake features a 0.675" bore diameter with 3/4-20 threading and a square shoulder design in a durable black finish.Mini Muzzle Brake with 0.675" bore diameter3/4-20 thread pitch for secure attachmentSquare shoulder design for proper alignmentBlack finish for durability and appearanceCompact design for reduced overall lengthDesigned to reduce felt recoil and muzzle rise while maintaining a compact profile. The precise threading and square shoulder ensure proper installation and performance on compatible firearms.