RAM Tough-Ball with 1/4″-20 x .375″ Threaded Stud – B SizeThe RAP-B-379U-252037 consists of a 1″ diameter rubber ball, connected to a 1/4″-20 X .375″ male threaded post. The male thread matches most standard camera and camcorder female threads found on the bottom of the camera.Specifications:Thread Pitch: 1/4″-20 x .375″Ball Size: B Size (1″)Weight Capacity: Standard Use: 2 lbs, Heady-Duty Use: 1 lbMaterials: High-strength composite, stainless steel threadsPackaging Type: Poly BagWeight: 0.08 lbs