150Pcs Inner Teeth Star Lock Washers Assortment Set 7 Sizes M3 M4 M5 M6 M8 M10 M12 Quick Speed Star Locking Washers Locking Nuts Fastener ClipsFeature:1. It is made of high-quality materials and has a long service life;2. Easy to use, all pads are packed in a strong clear plastic box for easy access. Specification:Product Color: BlackProduct Material: 65 Manganese SteelSurface Treatment: Black AnodizedScope of Application: Widely used for shock absorption and insulation in machinery, furniture, electrical appliances, electronic equipment, automobiles, sports equipment and industrial productionProduct Feature: lock washer exerts elastic force between the connector head and the base material to achieve greater frictional and rotation resistanceSize:M3*9mm: diameter inner 3mm outer diameter: 9mmM4*12mm: inner diameter 4mm outer diameter: 12mmM5*12mm: inner diameter 5mm outer diameter: 12mmM6*14mm: inner diameter 6mm outer diameter: 14mmM8*18mm: inner diameter 8mm outer diameter: 18mmM10*20mm: inner diameter 10mm outer diameter: 20mmM12*25mm: inner diameter 12mm outer diameter: 25mmNote: These are small parts, please keep away from children. Note: There may be slight size deviations due to manual measurement, different measuring methods and tools. The picture may not reflect the actual color of the item due to different shooting light, angle and monitor.30 X Star Lock Washers M330 X Star Lock Washers M420 X Star Lock Washers M520 X Star Lock Washers M620 X Star Lock Washers M815 X Star Lock Washers M1015 X Star M12 Lock Washers