Scotch-Brite Surface Conditioning Discs are an ideal first step for cleaning, blending, deburring and finishing on all types of metals. These 5 surface conditioning discs are built with durable, conformable nonwoven fibers that work great on irregular or contoured metal surfaces without undercutting or damaging the base material. Medium grit aluminum oxide mineral is evenly distributed within the nonwoven fiber to deliver a consistent cut during rust removal, weld cleaning, deburring and other metalworking surface prep. Combining abrasive mineral with the fibers results in a deburring disc that delivers consistent results over the life of the product. The 3M hook-and-loop attachment on the back side of the surface conditioning disc makes it easy to attach and change-out discs in multi-step metal surface prep processes. Simply attach the surface conditioning disc to a hook-and-loop backup pad on either a right angle grinder or random orbital sander and run the tool at a maximum of 13,000 rpm