The super crab gripper clamp is constructed from aluminum and steel materials with interior nonslip rubber padding to prevent slipping or scratching. This clamp provides a 0.4 to 2.3" opening range to fit onto a tripod leg, water pipe, handrail, pole, shelf, table, branch, or more. Featuring a contoured blue T-handle for a firm gripping force, it allows you to comfortably lock or release it. The clamp has 1/4"-20 and 3/8"-16 threads to provide mounting points for optional accessories, such as a camera, LED light, or monitor.