200pcs m5-m14 solid copper washers flat ring assorted set professional hardware in box

this set of flat washers are made of copper of good electrical conductivity and thermal conductivity. flat washers can spread a load, and prevent damage to the surface being fixed, and insulate steel screws from surface. can be used as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration. flat washer is applied when the hole is a larger diameter than the fixing nut. there are many different sizes of washers in this set from which you can use for different purposes. this 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..syi