Standard 1/4"-20 D-Ring D Shaft Thumb Mounting Screw Adapter Converter for DSLR Camera Tripod Monopod Quick Release Plate (5 Pack) 1/4"-20 screw can be used for DSLR camera camcorders, tripods, monopods, quick release plates, tripod heads, ball heads, lens plates, etc. This quality robust captive screw allows the fitment of different styles of plates to fit directly. 1/4" metal male thread with flat head screwdriver slot and hinged "D" Ring. D-ring with flat head screwdriver slot , can drive it by coin or screwdriver. The main body was made of Stainless steel, and the Rotatable D-ring made of ZINC Alloys.