Features: Double-layer screw type clamp - quick release plate can be installed on both the upper and lower layer, improve your creative ability, highly suitable for photography fans. Anti-drop mounting groove design - prevents the quick release plate (the M3 installation set screw) from accidentally slipping. Durable&reliable&anti-wear - perfect effects come from high level of anode anti-oxidation treatment. High class superior aluminum alloy, high precise production processing, reach to super high level degree of finish. Good hand feeling - high precise CNC processing, anti-wear high level superficial anode anti-oxidation processing. Matte finish makes it more resistant to dirt and wear. Compatible with all AS standard quick release plates for ARCA-SWISS, RRS, KIRK, MARKINS, SUNWAYFOTO, etc. Specifications: Product: Quick Release Plate&Quick Release Plate Holder Material: aluminum alloy Length: Approx 78mm/3.1inch Width: Approx 78mm/3.1inch Thickness: Approx 36mm/1.4inch Screw: 1/4 inch Size: Approx 7.8*7.8*3.6cm/3.1*3.1*1.4inch Weight: Approx 230g/8.1oz Package list: 1 * DB-50 Quick Release Plate Holder Instruction for use: If the user has a quick release plate or a long plate holder, the device can only be moved back and forth or left and right, but not both. If you install this two-way holder on the quick-loading longboard and then install a long-board in the upper-layer holder, since the two-layer holders remain vertical, you can slide your device back and forth. There is no need to move the tripod back and forth or left and right. 1、Double-layer screw type clamp - quick release plate can be installed on both the upper and lower layer, improve your creative ability, highly suitable for photography fans. 2、Anti-drop mounting groove design - prevents the quick release plate (the M3 installation set screw) from accidentally slipping. 3、Durable&reliable&anti-wear - perfect effects come from high level of anode anti-oxidation treatment. 4、High class superior aluminum alloy, high precise production processing, reach to super high level degree of finish. 5、Compatible with all AS standard quick release plates for ARCA-SWISS, RRS, KIRK, MARKINS, SUNWAYFOTO, etc.