Item Type: External Tooth Star Lock WasherMaterial: 304 Stainless SteelSpecification: M2.5 50pcs, M3 100pcs, M4 50pcs, M5 50pcs, M6 25pcs, M8 25pcsPackage List300 x Washer1 x Storage BoxManual measurement may have error. Please make sure you don't mind before ordering.1Specification: This external tooth washer assortment kit contains M2.5 50pcs, M3 100pcs, M4 50pcs, M5 50pcs, M6 25pcs, M8 25pcs. 2Single Ring Washer: The external tooth washer opening is misaligned, also is the single ring washer. When the nut is tightened with a wrench, the teeth of the wrong opening will be embedded on the surface of the part to prevent the nut from loosening. 3Resistant to Corrosion and Rust: Our external tooth star lock washer is with resistance to corrosion and rust. Prevent nut or bolt from loosening due to the supporting action of teeth. 4304 Stainless Steel: This external tooth washer assortment kit is made of 304 stainless steel material with exquisite workmanship. 5Wide Application: This external tooth washer assortment kit is widely used in cylinders, automobiles, valves, electrical appliances, spraying, doors and window, ships, machinery and so on. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.