The bowl adapter allows you to convert 75mm bowl mount tripods to a standard 3/8inch stud screw flat. If you have bowl type tripod and have flat mount type fluid head, the adapter be helpful. Made of aluminum alloy, very . Compatible for 501, 502, 504 tripod heads and other tripod heads with 3/8inch screw hole. Comes with 1/4inch screw and 3/8inch screw, convenient to directly mount quick release plate on the bowl adapter. Bowl Diameter: 75mm Head Screw: 3/8inch Screw Mounts: 1/4inch & 3/8inch Color: Black Material: Aluminum Alloy Package Contents: 1 x Camera tripod accessory 1 x Chinese and English instruction manual 1 set x accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.