ITEM NAME:150 Pcs Copper Sealing Flat Washer Gaskets Set Threaded Bolt Connection Description: Made of copper, high conductivity & corrosion resistant It contains 150pcs/15 Sizes of the most commonly used copper washers which are sturdy, durable and easy to install Used to support and spread the load across the baring area of the bolt and nut to prevent pull through Great for sump plugs, water, fuel and hydraulic fittings Perfect for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection Specification: Each size of flat washers are packed of 10. "M5" is referring to 5mm. 150 washers, 15 sizes are included in all. Detailed size: M5 x 9 x 1mm M6 x 10 x 1mm M6 x 12 x 1mm M8 x 12 x 1mm M10 x 14 x 1mm M10 x 16 x 1mm M10 x 18 x 1mm M12 x 16 x 1mm M12 x 18 x 1.5mm M14 x 18 x 1mm M14 x 20 x 1.5mm M16 x 22 x 1.5mm M18 x 24 x 1.5mm M20 x 26 x 1.5mm M22 x 28 x 1.5mm Box Size: 130 x 68 x 22mm / 5.12 x 2.67 x 0.86" Package Includes: 150 pcs copper washers packed in box SKU: DMO0022731779003416.Used to support and spread the load across the baring area of the bolt and nut to prevent pull through. It contains 150pcs/15 Sizes of the most commonly used copper washers which are sturdy, durable and easy to install.