1. Made of 304 stainless steel material, the 304 stainless steel material provides strength and offers good corrosion resistance in many circumstances. 2. Flat washers can spread a load, and prevent damage to the surface being fixed, and insulate steel screws from surface. 3. Can be used as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration. 4. Flat washer is applied when the hole is a larger diameter than the fixing nut. There are many different sizes of washers from which you can choose the proper ones. 5. Each set includes many flat washers that can be used for a long time, so you don't have to run to hardware store looking for washers for quite a while. 6. The washer is a thin disk-shaped plate with a hole in the middle that is normally used to distribute the load of a threaded fastener, such as a screw or nut. Other uses are as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration. Bolted joints require hardened steel washers to prevent the loss of pre-load after the torque is applied. Washers are also important for preventing galvanic corrosion, particularly by insulating steel screws from aluminum surfaces. 7. Features: 8. Made of 304 stainless steel material, the 304 stainless steel material provides strength and offers good corrosion resistance in many circumstances. 9. Flat washers can spread a load, and prevent damage to the surface being fixed, and insulate steel screws from surface. 10. Can be used as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration. 11. Flat washer is applied when the hole is a larger diameter than the fixing nut. There are many different sizes of washers from which you can choose the proper ones. 12. Each set includes many flat washers that can be used for a long time, so you don't have to run to hardware store looking for washers for quite a while. 13. Specifications: 14. Material: 304 stainless steel 15. Type: Flat washer 16. Color: Silver 17. ID*OD*Thickness & Quantity(Optional): 18. M1.6*4*0.3 100pcs 19. M2*5*0.3 100pcs 20. M2.5*6*0.5 100pcs 21. M12*24*2.5 50pcs 22. M14*28*2.5 50pcs 23. M16*30*3.0 50pcs 24. M18*34*3.0 50pcs 25. Package Includes: 26. 1 set x Washers