• The Haoge 64mm (2.52") Discal Clamp is a Arca Swiss compatible screw knob clamp.
• It has a captive knob, safety-stop grooves, and a hollowed-out design that reduces the weight of the clamp.
• You can use an screw to mount it to an AS style ball head or panoramic head, and it will accept any standard Arca-Swiss quick release plate.
• There is a 3/8" threaded hole at the center for mount the clamp onto a tripod or monopod, and also comes with a 3/8" to 1/4" screw adapter.