Desmond brand 100mm DAC-100B Arca-Swiss compatible Quick Release Clamp. with detachable bubble level. 3/8′ Standard thread will fit on any standard tripod or head. 1/4′ steel bushing adapter (included) converts it to 1/4′ thread. All metal construction 100mm (4′) in Length. Weighs 111g (4oz). Compatible with all Arca Swiss style plates.