Manley LocCap valve locks are designed with high-revving track cars in mind. These valve locks are precision-machined using Manley's TensileMax ultra high-strength steel or high-quality titanium and are through-hardened to minimize wear. The internal retention groove is perfectly matched with Manley's LocCaps, giving you a perfect fit without fail. These valve locks are available for a variety of valve stem configurations. Whether you are racing all-out fuel cars, alcohol, or Pro Mods, you can count on these Manley LocCap valve locks to keep everything in place.