Our Solid Carbide Burrs are simply the best available. We stock a ton of different sizes shapes cuts and lengths so we will always have the exact tool that you need for any particular porting or Metal removal job. All of our burrs utilize a precise straight 1/4" shank in a 2" length. Double cut burrs are general purpose and will make a small controllable cut that is suitable for cast iron or aluminum. Our aluminum cut burrs are for soft non-ferrous Metals or non-Metals and are great for removing large amounts of material very quickly. Our burr kits combine our most popular part numbers a burr stand and considerable savings. Tip: Use double cut burrs for all finish grinding continually spray the tip with silicone spray Lube to prevent load-up when working with aluminum.