Description: Tripod Ball Head Quick Release Plate Adapter Clamp. For Arca Swiss standard quick release plate 38mm width. With two thumb knobs, adjustable width of the clamp. High quality aluminum alloy material, anodized surface, light weight and durable. 3/8" screw hole, connect 1/4" to 3/8" nut, camera flash hot shoe and other photography accessories. Specification: Material: Aluminum Alloy Size: 88x62 mm/3.5x2.4 inch Package Includes: 1x Quick Plate Clamp 1x Screwdriver