pangshi D-Ring Hinged Screw Quick Release Camera Fixing Screw with Standard 1/4"-20 Thread Compatible with Camera/Tripod Qr Plate, Pack of 5 D-Ring Screws,Precision made 1/4"-20 Stainless Steel (metal) Tripod screws. 1/4" metal male thread with flat head screwdriver slot & hinged "D" Ring. 1/4"-20 screw for quick release plate. The main body was made of Stainless steel, and the Rotatable D-ring made of ZINC Alloys. Please refer to the size to ensure it work with your camera and quick release plate before shopping