9/16 x 24 Threaded barrel protector. It is machined from US made steel to very high quality standards on CNC lathes in my shop. It has a durable black oxide finish. It is counter bored to accommodate barrels that are not undercut at the shoulder. Length is .460" Outside diameter is .730 With a Great looking splined surface. You will not find these anywhere else! Fitsthreaded Barrels with a 9/16 x 24 tpi right hand thread. Please confirm your thread size before ordering.