If you're into stained glass, lampworking, or any glass art, a good grinder bit is essential. This Gryphon 1-inch diamond-coated bit is a workhorse. The 120 grit is a great all-purpose coarseness for smoothing sharp edges, shaping pieces, or notching glass. The unique \mirror grooved\ design helps prevent the glass from \biting\ or chattering, giving you a smoother, more controlled grind. It's built to last with Gryphon's quality, so it won't wear out too quickly. The best part? It has a standard shaft size, so it should fit most common glass grinder models (like Gryphon, Inland, Glastar, etc. – but always double-check your machine's specs). Just swap out your old, worn bit for this one when it's time for a refresh. It'll make your glasswork safer, cleaner, and more professional-looking. A must-have tool for any serious hobbyist or professional glass artist.