Diablo, 4 Pack, 5”, 320 Grit, Hook Loop, Sanding Disc, Premium 12 Hole Random Orbital Sanding Discs With Hook Lock Backing Include Break Through Innovations That Improve Performance, Extend Sanding Life Increase Productivity, Featuring Premium Ceramic Blend, Remove Material Faster Than Other Sanding Discs Offer An Extra Long Sanding Life, Clog Shield, Blend Of Grinding Agents, Reduces Loading Maximizing Productivity, Superior Grain Bonding System, Endura Bond, Longer Life Extreme Durability