The Sunwayfoto DDY-64iL Discal Clamp 64mm With Long Handle is a Arca-Swisse compatible integral screw-knob clamp with an anodized black finish. It has a captive knob, safety-stop grooves, and a hollowed-out design that reduces the weight of the clamp. It also has an extra-long handle, making it possible to mount it on the DYH-90 or DYH-90R leveling base. You can use an M6 screw to mount it to an AS-style ball head, and it will accept any standard Arca-Swiss quick-release plate. This Discal Clamp also has an integrated bubble level.