Product Description Specifications Constructed from one piece of seamless .105" wall chromemoly steel then black oxide coated and heat-treated, this 7.750" long Hi-Tech 5/16" diameter pushrod is 17% stiffer than .080" wall Hi-Tech pushrods. Category: Engine Components>Push Rods Core: N LTL: N MPN: 8410-1 Proposition 65: Y Special Order: Y