Review on Top-rated 4Pcs 6mm(1/4”) Shank Tungsten Carbide Rotary Cutting Burr Die Grinder Bit - Perfect for DIY Woodworking, Metal Carving, Polishing, Engraving, Drilling - Length 150-160mm by Lance Gunn

Used these rotary cutters along with some drill bits to remove a lock from an old fireproof filing cabinet. These ridges worked like a champ! At the end of the project the lock became a little box of brass shavings and most of the work was done by these burrs. The overall length of these drill bits is approximately 6 inches, making them the perfect tool for "turning" the lock after I've drilled through the drums. I would buy them again in a heartbeat, but looks like I'll be able to use them for a long time. I definitely got my money's worth. And the variety of tip shapes really helped get the job done no matter what angle I was using the cordless drill. Great item for the DIY enthusiast!