Product Features: Universal for GOPRO two card slot and other extension rods with two card slot camera cage and other adapter to expansion accessories; The three card holder part is adjustable 360° infinitely damped rotation, stable and quiet; Support clamping 30~32mm tube diameter, with removable tube diameter plastic sleeve, clamp 22~25.5mm tube diameter after installing the sleeve, adapt to most of the bikes on the market; Quick release and quick install structure, no need to remove the screws every time when you take the camera; Parameters: Aluminium alloy surface technology: surface anodic oxidation treatment Size: 85*50*25MM Colour: black Material: aluminium alloy Product weight net weight: 73g Packing list:Quick release bicycle clip*1