Lenox MetalMax Diamond Edge Cutoff Wheel, 4" x 5/8", is an alternative to bonded abrasive cut-off wheels. Breakthrough diamond technology delivers 1,000 or more cuts and 30X longer life than thin bonded cutoff wheels without sacrificing speed or finish. Made of solid steel to greatly reduce the risk of breakage, the combination of a steel body with a diamond edge allows MetalMax to hold its original wheel diameter until the last cut, meaning better control, reach, and cut precision throughout the wheel life. The enhanced design substantially reduces dust particles and lessens odor.