Features 1、Made of high quality aluminum alloy with CNC machining and anode anti-oxidation surface, sturdy, durable, wear-resistant and corrosion-resistant. 2、Built-in high contrast bubble level ensures the accuracy of vertical or horizontal photography. 3、Knob type operation design makes it easier to mount onto ball head, bracket, tripod and other accessories. 4、Compatible for AS standard quick release plate, including for Arca Swiss, for RRS, for Kirk, for Wimberley, for Markins, for Sunwayfoto, for Kangrinpoche, for Benro, for Sirui, etc. 5、Easy-recognized engraved scale on the both sides. Specification Item Type: Quick Release Clamp Model: CL-90N Material: Aluminum Alloy Color: Black Thread Standard: 3/8 inch (one 1/4 inch to 3/8 inch screw adapter) Size (LxWxT): Approx. 90x64x14 mm/ 3.54x2.52x0.55 inch Clamp Opening Width: Approx. 34-38 mm/ 1.34-1.50 inch Package List 1 x Quick Release Clamp