"The Haoge 58mm (2.28"") Disc Clamp is an Arca Swiss compatible screw button clamp. It has a captive button, safety stop grooves and an openwork design that reduces weight of the clamp. You can use an M6 screw to mount it to an AS style ball head or pan head, and it will accept any standard arca-swiss quick release plate. There is a 3/8"" threaded hole in the center to mount the clamp on a tripod or monopod Features: Arca Swiss standard quick release clamp Quick loading base with anti-slip lock function Aluminum alloy, CNC precision machining, surface oxidation treatment. With standard 3/8" UNC female thread, can be used on virtually any head, tripod or monopod. Compatible with standard plates such as: RRS, ARCA--SWISS/KIRK/Wimber ley/MARKINS / SUNWAYFOTO / Kangrinpoche / BENRO / SIRUI etc. Compatible with ball head, tripod or monopod of Gitzo, Manfrotto, RRS, arca-swiss... Specifications: Material: aluminum alloy Color: black Length: 75mm Width: 58mm Thickness: 15.5 mm Item Weight: 70g Package Included: 1 x Haoge CP-58 58mm Quick Release Clamp"