The ball adapter is a bolt that can be attached to an arm adapter or bridge of an underwater video lighting system.M6 1-inch ball head mount for underwater handheld stabilizer handles.Suitable for standard M5 and M6 tapped holes.Connected to fill underwater lights, video lights, diving flashlight systems.Made of aluminum, it is light weight, durable and corrosion resistant.Accessories for diving, diving and other water sports.Color: Black + redMaterial:Aluminum alloysize:About 4.5*1cmPackage Contents:1 * 4/1 screw sphereOnly the above package content, other products are not included.Note: Light shooting 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.