DESCRIPTION:
--Flanged Hex Nuts With Serrated Face,Reducing The Chance Of Damage To The Part And Making It Less Likely To Loosen As a Result Of An Uneven Fastening Surface. Because Of The Serrations They Cannot Be Used With a Washer Or On Surfaces That Cannot Be Scratched. The Serrations Help In Avoiding Vibration Of Nut And Increase The Holding Power Of Nut.