Scotch-Brite Universal Surface Conditioning Back-up Pad is designed to optimize the performance of nonwoven abrasive discs. It comes packaged with everything you need for quick and easy tool attachment, including three attachment nuts and an optional snap-in center post.Optimized for Nonwoven Abrasives. To get the right finish, you need the right abrasives, tools and accessories. That’s why 3M engineers developed the Scotch-Brite Universal Surface Conditioning Back-up Pad. Designed for performance and flexibility, this pad can be used in multiple configurations depending on your disc type — with snap-in center post for discs with center holes, or without the center post for flat finishing applications. The Full System Advantage: The Scotch-Brite Universal Surface Conditioning Back-up Pad is part of a complete surface conditioning system. When you combine this back-up pad with Scotch-Brite Surface Conditioning Discs and a 3M Angle Grinder, you’re helping to set yourself up for a new level of productivity. When used together, the effectiveness of each component is enhanced to provide optimal abrasive performance — including abrasive life, cut-rate and consistency.