Cloyes' patented Hex-A-Just® was an industry breakthrough when introduced in 1992. The accuracy and simplicity of the Hex-A-Just® system is unmatched by our competitors. Sprockets are made of SAE 1144 induction heat-treated, billet steel. The Renold True® Roller chain features full roller action and superior strength. Rollers are made from high strength steel, which is rolled and hardened to exacting standards. The Hex-A-Just® True® Roller Sets are infinitely adjustable to plus or minus six degrees. No machining required, no fumbling with offset bushings. This patented technology saves you hours of valuable set-up time. Simply dial in the timing and tighten the cam bolts, locking the cam position in place. Hex-A-Just® Sets feature: Billet Steel, Induction Hardened SprocketsRenold True® Roller Chain with . 250 Diameter Rollers3 Keyway Crank Sprocket for even more Adjustment CapabilitySets Matched at the Factory to Assure True Center DistancePLEASE NOTE: All Ford Sets include One Piece Fuel Pump EccentricAll Chevy (non-Factory Roller Cam) Sets Include Captured Needle BearingPit Stop USA offers Cloyes Hex-A-Just® True Roller Timing Chain Set - SB Chevy 85-Up 305-350 (-.005) 9-3145A-5 at low everyday prices. Be sure to check out all of our products from Cloyes including Cloyes Timing Chains - Small Block Chevy.