Usage Tips:Descirption: Features:Standard bowen bayonet mount metal chuck, 360 rotation, 16 support holes.The diameter of the support rod is 8mm, the distance between the centers of the two holes is about 35.5mm, and the distance between the 16 holes is the same.Can be used for almost all different photography light accessories on the market.Made of aluminum alloy, strong and durable, not easy to deform, and strong bearing capacity.The tightness of the chuck can be adjusted freely through the nut, and it can be used for external expansion flash, LED light, outdoor shooting light, etc. Specification:Material: Aluminum AlloyColor: SilverSize: Approx. 20x20x7 cm/7.87x7.87x2.75 inch Notes:Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes:1 Piece Bowen Mount