These are high quality nuts with allen set screws to provide you with that positive lock needed for Race or original equipment Rocker Arms.
Product Features:- They Are Zinc Dichromate Plated Steel
- They Have Black Oxide Coated Set Screws
- Keeps Rocker Arms Positively Locked
- (16) Rocker Arm Nuts w/ Locks 3/8"-24 Threads
- Includes Locks and Hex Wrench
- Shank O.D. .603"