High Impact ABS Plastic. Clamp Hook Allows Tripod Scrim to be Attached and Removed in Seconds. No Tools RequiredFits most poles: 35-38mm Weight: 0.2 kg. The Scrim Hanging Clamp allows the top of a tripod scrim to be held easily and securely to the upright pole of most tripod stands. The clamp hook allows any tripod scrim with a top loop to be attached and removed in seconds and fits most tripod stands with a tube diameter between 35-38 mm.. scrim clamp