Product Description Specifications Constructed from hardened steel alloy, COMP's locator cups handle high RPM and extreme spring pressures while holding the spring. Our 4706 locator features a 1.830" 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: 4706-16 Proposition 65: Y Special Order: Y