9mm M13.5×1 Left Hand barrel Thread 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 designed for metric threaded barrels.
It will fit Glock , Heckler and Koch, Beretta and more.
Length is .525″
Outside diameter is .640 With a clean crisp knurl.
Please confirm your thread size before ordering.