This handy three-in-one fixture helps you chamber rifle or pistol barrels, including contoured barrels, regardless of length, from the chuck side of your lathe. Also use it to true up any bolt or bolt face, and to true up Remington actions. Fits a four-jaw independent chuck; may be modified for use in three- or six-jaw chuck. Machined aluminum tube with hardened steel setscrews that are brass tipped to prevent marring the work piece. Built-in safety feature prevents setscrews from sticking out beyond the fixture and catching on your clothes. Mfg: Viper Bench Rest SPECS: Machined aluminum, matte black finish. Steel setscrews. 7" long, 4" O.D., with a 1A 1/2" dia. through hole. Slot size is 4-1/2" x 1.