Metal construction, precision forging processing, very fine anode surface treatment. The bottom comes with a 1/4-3/8" adapter screw, can be widely applied to various professional tripods monopod. This Aluminium Clamp Adapter with Quick Release Plate compatible most ballhead gives you the freedom to remove the camera from the head without detaching it from the plate and put it on any other Acra-Swiss Style Systems. Can be used with tripod, rail, stabilizer and different devices, for Photography Fast switching between different devices without replaceing the quick release assembly. Specification: Item Size: 85x50 x20mmL * W * H Quick release plate size: 60 x 38 x 10mm L * W * H Material: Aluminum alloy Package Includes: 1Piece X Quick Release Adapter 1Piece x Quick Release Plate