2 PCS Quick Release Clamp: 1 x CL-90N & 1 x CL-70N     Made of high quality aluminum alloy with CNC machining and anode anti-oxidation surface, sturdy, durable, wear-resistant and corrosion-resistant.     Built-in high contrast bubble level ensures the accuracy of vertical or horizontal photography.     Knob type operation design makes it easier to mount onto ball head, bracket, tripod and other accessories.     Compatible for AS standard quick release plate, including for Arca Swiss, RRS, Kirk, Wimberley, Markins, Sunwayfoto, Kangrinpoche, Benro, Sirui, etc. Easy-recognized engraved scale on the both sides.          This clamp is suitable for Arca Swiss Quick Release Plate.     CNC precision aluminum alloy built with anodic anti-oxidation surface treatment     With 3/8 inch thread and 3/8 inch to 1/4 inch convertible screw, so you can easily mount it on tripod.     Scale on both sides will Helps to position the quick release plate accurately     Built-in spirit level for precise balance     Item Type:Quick Release Clamp     Model: CL-90N & CL-70N     colour:black     material:Aluminum alloy + metal     size: 90x64x14 mm & 96 x 70 x 20mm          Package Contents:     2 x Quick Release Clamp          Only the above package content, other products are not included.     Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.