Tiger Rock .750 Low Profile Steel Gas Block w/ Clamp-On Packaged Stainless Silver Small. It's Clamp-on design tightens securely around a .750in barrel without damaging or marring the finish. Comes in protective plastic packaging. Note: Not designed for bull barrel mounts Features of Tiger Rock .750 Packaged Low Profile Gas Block Clamp-On Design Package Contents: Tiger Rock .750 Packaged Low Profile Gas Block Roll Pin 2 Set Screws Allen Wrench Tiger Rock GB06-S#: .750 Low Profile Steel Gas Block w/ Clamp-On Packaged Stainless Silver Small