.Short Grip with Ergonomic Design..1/4"-20 Screw with Thumbwheel,1/4"-20 Threaded Hole on the Bottom..Is a short grip with an ergonomic design allowing a comfortable fit in your hand. It offers a 1/4"-20 screw on top for attaching a camera, camera cage, or smartphone cage/rig, and the screw conveniently secures via a thumbwheel on the side of the grip, so no tools are needed.