The LBE Low Profile Gas Block features a .750" steel nitride finish and comes with a rifle length gas tube pre-installed for reliable firearm operation.LBE Low Profile Gas Block with Rifle Length Gas Tube.750" diameter with steel nitride finishRifle length gas tube pre-installedGas tube made from 304SS seamless tubingDesigned and built in the United StatesRigorous quality control and American manufacturingPerfect for AR-15 builds and modifications this gas block delivers trusted performance with precision engineering and durable construction for reliable cycling in various applications.