Built-in spirit bubble which accurate photography balance Easy to replace and install without additional tools aviation aluminum alloy, high-end anode sandblasting oxidation and machining, it is strong, stable and safe to use Standard Arca for type, suitable for most quick release plates, such as ARCA-SWISS With a 3/8 inch screw hole and 3/8 inch to 1/4 inch, which can be connected to a tripod, selfie stick, camera cage, ball for head plate, monopod