This is a direct replacement quick release plate for the ProMaster GH31C Carbon Fiber Gimbal head (product code 2393), GH30C (code 2544) and also for the ProMaster GH26 Aluminum Gimbal head (code 9278). It has both 1/4-20 and 3/8-16 mounting bolts as well as a spring-loaded, retractable anti-twist pin. The anti-twist pin is removable. Two safety bolts on the bottom of this QR prevent it from accidentally sliding off the head. The safety bolts are removable. This QR uses a dovetail design that is also compatible with most other types of heads using an arca-swiss style quick release system.