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 to hold an accessory, such as a camera, LED light, or monitor weighing up to 7.7 lb. Featuring a comfortable red T-handle for a firm gripping force, it allows you to comfortably lock or release it. The 3/8"-16 and 1/4"-20 threaded holes facilitate the mounting of various types of devices with compatible screws.