Product Description The Yankee Hill Machine Co sRx Thread Protector is a protective cap designed to keep the threads on your sRx mounts clean and protected from dirt, debris, and damage when your suppressor is not in use. Built from durable 4140 chrome moly steel and finished in black oxide, it&&';;s designed for use with the YHM sRx System and any suppressor using standard 1 3/8" (1.375") threads. Product Highlights Protects sRx mount threads from dirt and damage when the suppressor is removed Precision protective cap made from 4140 chrome moly steel for strength and longevity Black oxide finish for corrosion resistance and a low-profile look Compatible with the YHM sRx System and any suppressor with 1 3/8" (1.375") thread Compact, lightweight design for easy carry and storage Specs Brand: Yankee Hill Machine Co Manufacturer Part Number: YHM-4450 UPC: 841812101987 Product Type: sRx thread protector / protective cap Material: 4140 chrome moly steel Finish: Black oxide Compatibility: YHM sRx System and any suppressor with 1 3/8" (1.375") thread Length: 0.5625 in Diameter: 1.0 in Weight: 0.448 oz 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.