Various photo heads. The base plate is designed to be quick release plate style, which can be mounted directly on the quick release (QR) clamp of tripod. There are 1/4"-20 & 3/8"-16 threads on the base of the bracket for attaching to non-camera heads and adapters. In addition there are two 1/4"-20 threaded holes on the stem of the bracket which can be used to store protective caps from your binoculars.