Product DescriptionThe GrovTec US Inc GTHM319 crush washers are designed to help properly install and secure muzzle devices on compatible rifles. Made from high-quality steel with a premium black nitride finish, these washers are built for reliable performance and durability. This pack includes five crush washers for convenient spares and multiple installs.Product Highlights Designed to secure and time muzzle devices during installation Premium black nitride finish for added durability and corrosion resistance High-quality steel construction for dependable fit and function 1/2"-28 thread application commonly used with .223/5.56 platforms 5-pack provides extras for future muzzle device changes or buildsSpecs Brand: GrovTec US Inc Manufacturer Part Number: GTHM319 UPC: 811071013451 Product Type: Crush washer (muzzle device accessory) Caliber/Application: .223 Thread Pitch/Application: 1/2"-28 (threads per inch) Material: Steel Finish/Color: Black nitride / Black Quantity: 5 per pack Compatibility: Universal (as specified by manufacturer listing)Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.