Velbon QB157 Velbon QB-157 Quick Release Plate for Velbon Sherpa Tripods. The Velbon QB-157 Quick Release Plate fits the Sherpa series tripods & features a 1/4 inche-20 camera screw. A quick release plate can be kept attached to the camera's base & allows the user to quickly & easily attach or remove the camera from the tripod without having to waste time fumbling with the threaded mount