4" Magna-Cutter Wheel Motor Guard's Magna-Cutter abrasive -off wheel has been specially formulated to aluminum fast, cool and clean with no loading. A resin-bonded abrasive -off wheel specifically designed for cutting automotive aluminum body panels and structural components, the Magna-Cutter is available in 3(JMC300AL) and 4 (JMC400AL) diameters. These Type wheels are made in the U.S.A. of the highest quality abrasives and materials. . Unlike standard wheels, they contain no ferrous materials, ensuring contaminant-free cutting of aluminum body panels and structural components. Technicians report that the Magna-Cutter exhibits exceptionally long wheel life and has quickly become an aluminum tool box essential. Specially formulated for aluminum body panels & structural components. Cuts fast, cool, & clean with no loading . Contains no ferrous materials, eliminates contamination. Long wheel life JMC400AL