Bosch 3-1/4", 5A, #3365. 18,000 rpm, belt drive, single blade. I think I bought it from Amazon.com. It cuts lead pretty well, although I had to stop after each pass to clear the ejector chute since lead chips are too heavy to vacuum out. I used this just on the keel to remove fairing compound, glass sheathing and lead. Of course, dispose of lead properly!