Haoge 1/4"-20 D-Ring Stainless Steel Mounting Fixing Screw for Camera Tripod Monopod Quick Release Plate (Pack of 2) 1/4" metal male thread with flat head screwdriver slot and hinged "D" Ring. Can be used with Camera, Tripods, Monopods, Telescopes, Ball Heads, Lens Collars, Lens Plates, Quick Release Plate and Other DIY used. Material: Stainless Steel