The torque is applied. Washers are important for preventing galvanic corrosion, particularly by insulating steel screws from aluminum surfaces. This set of flat washers is made of high-quality copper with good electrical and thermal conductivity. Flat washers can spread a load, prevent damage to the surface being fixed, and insulate steel screws from aluminum. They can be used as sps, wear pads, pre-load indicating devices, locking devices, and to reduce vibration. Flat washers are used when the hole diameter is larger than the fixing bolt or nut. This set includes multiple sizes for various applications. This set includes a large quantity of flat washers for long-term use. Copper washers are hardware products; minor surface scratches do not affect normal use and are not considered quality defects. Additional uses include acting as sps, wear pads, pre-load indicating devices, locking devices, and vibration reduction. High-quality bolted joints require washers to maintain pre-load. Specifications: Name: Washer Combination Type: Flat Washer ID × OD × Thickness × Quantity: M5 × 9 × 1 mm – 30 pcs M6 × 10 × 1 mm – 30 pcs M6 × 12 × 1 mm – 30 pcs M8 × 12 × 1 mm – 30 pcs M8 × 14 × 1 mm – 30 pcs M10 × 14 × 1 mm – 30 pcs M12 × 16 × 1 mm – 25 pcs M12 × 18 × 1.5 mm – 20 pcs M14 × 20 × 1 mm – 25 pcs M16 × 22 × 1 mm – 20 pcs M16 × 22 × 1.5 mm – 15 pcs M20 × 26 × 1.5 mm – 15 pcs Color: As shown Material: Copper Package Contents: 1 × Washer Combination Set Note: Light reflection and display differences may cause slight color variation between the image and the actual product. Measurement tolerance: ±1–3 mm.