Diablo, 50 pack, 5 In Ros Hook, Lock Disc Assorted Pack Diablo’s Premium Random Orbital Sanding Ros Discs With Hook, Lock Backing Include BreakThrough Innovations That Improve Performance, Extend Sanding Life And Increase Productivity Featuring A Premium Ceramic Blend, These Discs Remove Material Faster And Offer ExtraLong Sanding Life Than Other Sanding Discs ClogShield, Diablo’s Own Blend Of Grinding Agents, Reduces Loading Thus Maximizing Productivity The Superior Grain Bonding System, EnduraBond, Provides Diablo’s Sanding Discs With Longer Life And Extreme Durability