Outstanding lifespan in metal. No chipping, no odor emissions, no expiration date. Cutting metals like steel and cast iron has always been difficult for angle grinder discs. Many workers are familiar with the chemical smell of bonded discs that literally burn away while cutting. With the Expert Diamond Metal Wheel, that smell is a thing of the past - just like regular trips to the store to buy new metal discs. For craftsmen and construction workers who no longer want to spend money on bonded discs, the Bosch Expert Diamond Metal Wheel X-LOCK diamond cutting disc offers a completely new way of cutting metal. Extremely durable cutting edge with Bosch Diamond Technology.