The universal camera and camcorder base consists of a B size 1" ball, connected to a 1/4"-20 threaded steel stud. TPU over-molding ball joint, wear-resistant and anti-slip, for durability and reliability in the most demanding environments. The 1'' ball camera base compatible with RAM Mounts & BRCOVAN any B size 1 inch ball double socket arm. The male 1/4"-20 threaded steel stud of ball base will connect to any standard female thread found on digital cameras, camcorders, and other devices. Thread pitch: 1/4"-20 x .25" The 1 Inch ball adapter with 1/4"-20 threaded post for action camera & camcorder. Compatible with RAM mounts B size double socket arm. TPU over-molding ball joint, wear-resistant and anti-slip. Using threaded steel stud, for durability and reliability in the most demanding environments. (Pack of 2)