Item Type: Camera Arm Material: Aluminum Alloy + Stainless Steel Color: As Picture Shown Application: For Photography Studio, Photo, Video Gross Weight: Approx.421g/14.9oz Crab Clamp Interface: 1/4in Screw Hole, 3/8in Screw Hole Support Arm Interface: 1/4in Screw Package List 1 x Crab Clamp 1 x Support Arm 1 x Cold Shoe Mounting Base Please allow 13cm error/errors due to manual measurement. Thanks for your understanding. 1Flexible Usage: The kit includes crab clip, articulating friction arm, and cold shoe mounting base, which can be used independently or flexibly in scenarios as required. 2Adjustable for Use: Through the red knob, you can adjust the support arm in a 360 degrees rotation range, high stability, both ends have 1/4in screw, strong compatibility 3High Compatibility: Come with cold shoe mounting base, can be quickly combined installation, compatible with digital camera, camera monitor, LED light, camera cage, etc., applicable to a wide range of scenarios. 4Powerful Clamp: Crab clamp is made of high quality metal material, high strength and wear resistance, easy to install and use; Also has 1/4in and 3/8in screw holes for expandable auxiliary fittings. 5Firm Fixing: Clamping range is 0.8555mm/0.032.2in, which can be quickly fixed on the lamp holder, tripod and stage bracket; With non slip rubber pad, can increase friction protection equipment from scratches, so that the installation is more stable.