Lunati Keyway Adjustable Billet Timing Sets have steel billet gears and a nine keyway crank sprocket. The crank sprocket allows for one-degree adjustments with a maximum range of four-degree advance/retard. The heavy-duty, large-pin .250" double roller chain is prestretched and heat-treated for increased durability, and the set includes a Torrington roller thrust bearing on the cam sprocket to reduce friction. With this combination of superior components, Lunati's Billet Timing Set is a great option for street performance and race applications.