1/4" to 3/8" Male Threaded Screw Adapter for Camera Tripod Mono pod Ball head -The adapter screw is designed with one end of 3/8",and the other end of 1/4" made of metal material, and silver plated surface. -The maximum length is 20mm, and the maximum width is 16mm, used for all kinds gears with 1/4"or 3/8"screw hole. We carry many camera gopro accessories like battery, charger, lens cap, mount, etc.. - We specialize in Electronics, Computer, Cell Phone Accessories, Adapter & Cables Pickup Location: "Cable Link" Tel: 613-680-6188