Hi , I have a 5 inch aircraft aluminum drive wheel with a 3/4 inch bore that fits the KMG type grinders and other grinders that use a jackshaft and pulleys with 3/4 inch shaft. It has been machined on the sides to reduce weight and is crowned for stable tracking. The setscrew is included. $49.00 and I will pay the shipping within the continental US. Made is USA. This drive wheel will increase the surface feet per minute on a stock KMG 4 inch wheel from about 3600 surface feet per minute to about 4500 surface feet per minute or about 25% increase in surface feet per minute. (using a standard 1725 rpm motor) I accept Paypal , cashier's , or personal check. Thanks for looking, Larry Lehman