1. It is made of manganese steel and has a long service life.2. Easy to use, all gaskets will be packed in a strong transparent plastic box for easy access.3. Scope of application: Widely used for shock absorption and insulation in machinery, furniture, electrical appliances, electronic equipment, automobiles, sports equipment, and industrial production.4. Function: The lock washer exerts an elastic force between the head of the fastener and the base material to generate greater friction and rotation resistance.5. Surface treatment: black anodized6. Material: 65 manganese steel7. Product specifications:M3 x 9MM: inner diameter 3mm outer diameter: 9mmM4 x 12MM: inner diameter 4mm outer diameter: 12mmM5 x 12MM: inner diameter 5mm outer diameter: 12mmM6 x 14MM: inner diameter 6mm outer diameter: 14mmM8 x 18MM: inner diameter 8mm outer diameter: 18mmM10 x 20MM: inner diameter 10mm outer diameter: 20mmM12 x 25MM: inner diameter 12mm outer diameter: 25mm8. Product composition:M3 x 50 PCSM4 x 50 PCSM5 x 40 PCSM6 x 40 PCSM8 x 30 PCSM10 x 30 PCSM12 x 20 PCSSpecification: Package Weight One Package Weight 0.17kgs / 0.36lb One Package Size 14cm * 8cm * 3cm / 5.51inch * 3.15inch * 1.18inch Qty per Carton 150 Carton Weight 26.25kgs / 57.87lb Carton Size 42cm * 38cm * 32cm / 16.54inch * 14.96inch * 12.6inch Loading Container 20GP: 522 cartons * 150 pcs = 78300 pcs40HQ: 1212 cartons * 150 pcs = 181800 pcs