The magnetic attachment system gives instant fitting and has an adjustable lever system for extra security. Lightweight and durable, the adapter comes with a standard 1/4"-20 camera/optic screw, 3/8"-16 bushing and polymer plate. Turns your APEX Spartan Head into a stable optic and camera platform. Designed to attach to cameras and other optics with standard 3/8"-16 or 1/4"-20 threaded female mounting points.