Low Profile version is a low and narrow, one-piece block designed to fit inside most free-float hand guards; allows use of rifle length forearms on carbine length barrels for a clean, streamlined look and added gripping surface. Securely attaches to the barrel with included dual hex head setscrews.Unique, all-steel gas blocks expand the versatility of your rifle by providing a variety of accessory rail and hand guard mounting options. Especially helpful in customizing short-barreled tactical rifles. Designed Specifically for AR15s with a barrel diameter of .750" at gas port, including most standard carbine barrels. Will not fit heavy "bull" barrels or "pencil" profile lightweight barrels.FeaturesMachined from 17-4PH Stainless SteelWeighs only 0.66 ozMade in the USA