Built-in 1/4inch-20 and 3/8inch-16 Thread: The super clamp comes with universal 1/4 and 3/8 thread which allow more setups such as fix a ball head on it to connect your led light, action camera, microphone. And there are more setup choices to install your camera p o accessories. WIDE APPLICABILITY: It is universal that can fix onto any shaped body like cameras, lights, umbrellas, hooks, shelves, plate glass, bars, music stand etc NON-SLIP DESIGN: With non-slip rubber pad on the inner side of the crab clamp can not easy to slide down to provide strength and stability, but also protect equipment from scratch PRECISE AND ADJUSTABLE: Jaw Opens from 15mm to 52mm, You could mount it on anything from 15mm to 52mm, such as 15mm rods, 19mm rods, table, for handheld gimbal bar, table, bike handlebar, etc. STONG CONSTRUCTION: Made of materials, sturdy and . Specifications: Screw Mount: 1/4inch & 3/8inch screw holes Clamp Compatible Diameter: 15mm-52mm Material: Metal colour: silver+black Package Contents: 2 x Rod Clip Only the above package content, other products are not included. Note: Light reflection 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.