[Small and Lightweight] Small in size and light in weight, these screw washers are easy to install and ideal for various materials.
[Wide Application] Can be installed on many different types of materials, making them versatile for various industrial and diy applications.
[Pure Copper Material] The countersunk head screw gasket is to rot, , and oxidation.
[Easy to Use] The smoothly exterior and concentric design make these screw washers convenient to handle and provide a firm lock for fastening applications.
[Standard Concentricity] These screw washers have precise matching with a large bearing exterior for a secure lock.

Spec:

Item Type: Countersunk Screw Washer
Material: Pure Copper
Model Inner Diameter Approx. Outer Diameter Approx. Thickness Approx. Counterbore Angle Single Weight Approx.
M3 3.1mm / 0.1in 7.9mm / 0.3in 2.05mm / 0.1in 90° 0.52 g / 0.02 oz
M4 4.1mm / 0.2in 9.9mm / 0.4in 2.5mm / 0.1in 90° 0.88 g / 0.03 oz
M5 5.1mm / 0.2in 11.9mm / 0.5in 3.2mm / 0.1in 90° 1.63 g / 0.06 oz
M6 6.1mm / 0.2in 13.9mm / 0.5in 3.5mm / 0.1in 90° 2.35 g / 0.08 oz

Package List:
50 x Gasket