Made of aviation aluminum, CNC precision machining, surface oxidation treatment, precision scale, net weight about 77g. 2 pieces in combination can be used as vertical shoot quick release platez Compatible with RRS / ARCA-SWISS ball head of AS standard interface Total length is 123mm, length excluding pin is 120mm, width is 39mm, slide length is 95mm. The plate is ideal for large cameras with battery grip, such as Nikon D1/D1X/D1H, D2X/D2H, D3/D3S/D3X, D4, Canon 1D/1Ds series, etc. Can also be used for 120 cameras with screw hole in center, not suitable for ILDC cameras.