Prost Metal Lever Quick Release Plate Clamp IS-JZ80BK RRS Fit Ball Head Arca-swiss iShoot All-metal Lever Quick Release Plate Clamp IS-JZ80BK Compatible with Gitzo GH1780 / 2780 / 3780 series and RRS Fit Ball Head and RRS / ARCA-SWISS Fit Quick Release Plate Made of aviation aluminum and stainless steel, CNC precision machining, surface oxidation treatment, dimensions excluding the knob is about 80 x 63mm, weight is about 150g; Type :Lever Clamp Bases;Model :IS-JZ80BK Material : Metal