Product details:

Outside Diameter, .640 in. Heat-treated for maximum strength and durability, most are also black oxide coated to resist corrosion. Numerous options are available, including inside and outside diameters, with stock, 7 degree, or 10 degree lock style tapers. Various retainers will work with single, dual, and/or triple springs--standard or conical; a few applications are titanium. These parts are compatible with either Crane's stamped valve stem locks or machined steel locks. Find the proper fitment for your vehicle, along with the quantity required.