Guard4U 215Pcs 8-Size Metric Stainless Steel Nylon Insert Hex Lock Nuts Assortment Kit Perfect for Lock Washers
*Nylon Insert Lock Nuts are also known as stop nuts. Lock nuts are used for fastening to a bolt when mechanically joining materials together. The bolt threads into the nylon material are located at the top of the nut. The purpose of the nylon insert is to prevent backing off or loosening from vibration.
*Assortment of lock nuts in Metric for various household and automotive applications. Perfect for professionals, DIYers, and more.

*Material: 304 Stainless Steel,Nylon
*Packed in a plastic box. 

List：
Stainless Steel Nylon Hex Lock Nuts M2.5,50pcs; 
Stainless Steel Nylon Hex Lock Nuts M3,45pcs; 
Stainless Steel Nylon Hex Lock Nuts M4,35pcs; 
Stainless Steel Nylon Hex Lock Nuts M5,30pcs; 
Stainless Steel Nylon Hex Lock Nuts M6,25pcs; 
Stainless Steel Nylon Hex Lock Nuts M8,15pcs; 
Stainless Steel Nylon Hex Lock Nuts M10,10pcs; 
Stainless Steel Nylon Hex Lock Nuts M12,5pcs; 

These lock nuts are provisioned with nylon collars thus, eliminating the need for lock washers. These nylon collars of these nuts are made from an industrial-strength material has an increased grip, as a result, it's likely to last much longer and be more difficult to undo. It also performs better compared to lock washers as it is made out of non-corrosive material therefore reduces its proneness to leaking.

While the lock nuts themselves are made rigidly solid polymer making them highly resistant against turning, and they are more tightly adherent to each other which means that any exposure to vibration will not result in unlocking. Guaranteed to stay intact and in firm hold making them virtually indestructible.