The GrovTec GTHM320 Crush Washer in black nitride steel is designed to securely install muzzle devices on .308 caliber rifles with a precise 5/8"-24 thread pitch, delivering a reliable seal and consistent alignment for optimal performance. Built from high-quality steel and finished with a premium black nitride coating, this crush washer combines durability with corrosion resistance to withstand rugged use in varied environments. Sold in a pack of five, the GTHM320 provides shooters with an economical, ready-to-use solution for mounting and timing muzzle devices on compatible rifles, making setup quick and repeatable while helping maintain accuracy and barrel harmonics. The washers robust construction supports a snug, vibration-free fit that resists deformation during torque, ensuring long-term reliability when securing compensators, flash suppressors, or other muzzle devices. Whether upgrading a rifle build or performing routine maintenance, GrovTecs crush washer offers a practical balance of strength, finish, and ease of installation, enabling precise alignment and dependable performance across hunting, target shooting, and field applications.