The Tether Tools Rock Solid Master Clamp allows you to attach arms and other gear to round or flat surfaces, such as a tripod leg, table, or shelf, and can hold up to 33 lb. It offers a clamp range of 0.5 to 2.1" and comes with a wedge insert for secure use on flat surfaces. The Master Clamp features durable alloy construction and utilises a lift-ratchet style metal handle for easy and secure placement. For mounting, the clamp has a 5/8" baby socket for placing on a stand. It also includes a 5/8" baby stud with 1/4"-20 male thread for more mounting options. Additionally, it has a black finish to reduce reflections. Specifications Load Capacity: 33 lb Clamp Range: 0.5-2.1" Fits Round and Flat Surfaces Lift-Ratchet Style Handle Black Finish & Metal Construction Wedge Insert Locking 5/8" Baby Socket 5/8" Baby Stud with 1/4"-20 Male Thread Clamp Type Jaw Jaw Shape Round Jaw Opening 0.5 to 2.1 " / 1.3 to 5.3 cm Mount Type 1x 5/8" Receiver 1x 5/8" Stud 1x 1/4"-20 Male Load Capacity 15 kg Weight 0.5 g What's Included 1 x Tether Tools Rock Solid Master Clamp 1 x 5/8" Baby Stud with 1/4"-20 Male Thread 1 x Wedge Insert