8Sinn 1/4″x20 Hex Screw – Camera Fixing Screw Key Features – Stainless steel – Size & thread pitch: 1/4″x20 – Hex key size 4mm Standard screw for mounting your camera. Dedicated to cameras with the 1/4” x 20 mounting opening. Used mostly for mounting your camera on all kinds of camera plates like those included with tripods, monopods, or quick release plates included in baseplates.