Product Description The YHM Quick-Detach (QD) Mount Thread Protector is a protective cap designed to keep the ACME threads on your YHM Q.D. flash hiders and mounts clean and protected when your suppressor is not installed. It helps prevent dirt buildup and reduces the chance of thread damage during storage, transport, and general handling. Note: this thread protector does not fit the .338 QD mounts. Product Highlights Protects ACME threads on YHM quick-detach (QD) flash hiders and mounts when the suppressor is not in use Helps prevent thread contamination from dirt, debris, and grime Reduces the risk of thread damage during storage and transport Designed specifically for YHM QD muzzle devices and mounts that use ACME threads Does not fit .338 QD mounts Specs Brand: Yankee Hill Machine Co Manufacturer Part Number: YHM-3114 UPC: 816701012507 Product Type: Thread protector cap (suppressor mount accessory) Compatibility: YHM Q.D. flash hiders and mounts with ACME threads Fit Note: Does not fit .338 QD mounts 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 product&';s manufacturer.