Just had a friend blow up one wheel. Cut his lip drifted 4 teeth. he now uses his face shield..go figure. Chipping, toss it. Binding, toss it. Please use a regulator to match the rating of the die grinder. Use the shield that came with the die grinder if you can. Be careful. Cut off disk is cheap. Use another one. Are we getting the message out here? Please be careful. I kinda like talking to the folks on here.