Product Description Specifications Constructed from hardened steel alloy, COMP's locator cup handles high RPM and extreme spring pressures while holding the spring. Our 4704 features a 1.570" OD with a .640" ID that works with a number of our valve springs. Category: Engine Components>Valve Springs, Retainers Core: N LTL: N MPN: 4704-1 Proposition 65: Y Special Order: Y