Nascar Del West titanium valve locks, part# DW793C for the 5/16" valves & Super 7* or 8* retainers with .590"-.490" tapered hole in retainer.These have the radius groove and gives you STANDARD installed height. You get 8 pair of locks for 8 valves in this auction. These retail for $100 new. Check out my other items! Be sure to add me to your favorites list!