This clamp is made of aluminum alloy and stainless steel, rust-proof, durable, and well-made. The clamp has a thick non-slip rubber pad to protect your accessories from scratches and enhance stability. The adjustable range of size is between 15mm and 58mm, and any items within this range can be used, such as bicycle handlebars, motorcycle handlebars, tripods, selfie sticks, tables and chairs, etc. With 1/4 and 3/8" threads, you can install various photo / video related accessories with ease.