Black anodized CNC machined from 6061-T6 billet aluminum 9 polished revolver grooves are milled into housing Housing is internally threaded and features a screw-in bezel that provides a clean, seamless look and frenches the lamp Single filament MR11 20W halogen bulb with amber lenses A 5/16-24 x 1" hex head cap screw supplied (drilled for wire feed)