9/16 x 24 TPI Threaded barrel protector. It is machined from stainless steel to very high quality standards on CNC lathes in my shop. It has a great looking unique grooved finish. It is counter bored to accommodate barrels that are not undercut at the shoulder. Length is .460″ Outside diameter is .730 With a clean crisp knurl. Fits threaded Barrels with a 9/16 x 24 tpi right hand thread. Please confirm your thread size before ordering.