This kit contains 20 center cap screws for Torq Thrust Wheels, plus one extra in case one gets lost. They're designed for center caps with countersunk (e.g. "cone seat") holes to ensure a flush mount, NOT caps with non-countersunk holes. These hex drive flat head screws are made from stainless steel for excellent corrosion resistance. The threads fit all Torq Thrust Wheels including those made by American Racing, US Mags, E-T Classic V, Vintage Wheel Works V-40/45, etc. This kit does NOT come with an allen wrench for installation (buyer to utilize their own tool). The screws measure 3/8" long which accommodate standard thickness center caps. Please measure to verify that these will provide adequate thread engagement for your center caps (note: some thick caps may require longer screws).