Redcat Racing M3 Aluminum Nylon Lock Nut (6 Piece), Blue Redcat Racing Blue Aluminum Nylon Locknut (M3 6pcs) Genuine Redcat Racing Spare Parts Redcat Racing Part Number 02191B For troubleshooting and warranty information please contact a Redcat Racing Customer Service Specialist at 602-454-6445 or by emailing amazonsupport@redcatracing.com NOTE: Please read the User Manual before use.