Check the listing for details. Delrin Shift Knob for 6 Speed C5 Corvette 9/16-18 thread size. Condition: New. Listed at 59.99 USD. Introducing a new hardbar! It's an intermediate hardbar that fills the gap between the classic and oversize hardbars. We used customer feedback to give you what you wanted. We cut down the diameter a bit and increased the size of the taper on the bottom for a more comfortable feel. We also increased the counterbore depth so lower the height a bit more. 1.75" in diameter 3.5" long Tapers down to 1.2" at the bottom Counterbore on bottom, threads start 3/4" from bottom 9/16-18 thread/pitch for C5 shift rod 5.3 oz (150 grams) Delrin material (black, white,) This custom shift knob can be used with any manual transmission that has a 9/16-18 thread size. It's made from lightweight and durable Delrin (engineered polymer) material and has a specific tapped hole for the C5 or any other application with that thread size. This material is great for warmer climates or if you are getting alot of heat transfer from your shift rod linkage. The shift knobs are CNC machined to produce a nice matted finish and superior grip. They really look sharp in the interior. You have your choice of either a black Delrin, white Delrin. If you don't see your appication or thread size and pitch, just ask, we'll make it for you! Thanks for taking a look at our listing. Please add 6% sales tax if you are buying in CT.