Features Accurate Matching: The screw washing machine is accurate, the bearing of the bolt is very large and the lock is tight. The Appearance is Smooth: These spiral cushions have standard concentricity, smooth appearance, and concentric. High Quality Material: This Punterunk head screw pad is made of pure copper, which is not easy to rot, moisture and oxidation, and more at ease. Easy to Install: These spiral cushions are small, light weight, easy to install and use, bringing you more convenience. Excellent After-sales Service: We provide you with high-quality after-sales service. If you have any questions, please feel free to contact us, and we will deal with it for you as soon as possible. Specification: Item Type: Countersunk Screw Washer Material: Pure Copper ModelInner Diameter Approx.Outer Diameter Approx.Thickness Approx.Counterbore AngleSingle Weight Approx.M33.1mm / 0.1in7.9mm / 0.3in2.05mm / 0.1in90°0.52 g / 0.02 ozM44.1mm / 0.2in9.9mm / 0.4in2.5mm / 0.1in90°0.88 g / 0 ozM55.1mm / 0.2in11.9mm / 0.5in3.2mm / 0.1in90°1.63 g / 0.1 ozM66.1mm / 0.2in13.9mm / 0.5in3.5mm / 0.1in90°2.35 g / 0.1 oz Package List: 50 x Gasket Package List 50 x Gasket