The Bosch PRO Metal Cup Wheel has been designed for grinding metal with larger angle grinders with a locking nut. The PRO Metal Cup Wheel is a long-lasting cup wheel for metalworkers who need to grind metal and cast iron. The disc is highly efficient when cleaning surfaces or resharpening tools. The combination of premium abrasive grains and a strong bonding material gives the PRO Metal the strength you need to get the job done. It uses a combination of high-quality aluminium oxide grains and a strong synthetic resin bonding for strength and durability. For best results use it for coarse grinding with your bench grinder at a maximum speed of 8500 rpm.