Diablo's premium 4-1/2 inch x 5-1/2 inch 220-Grit (Ultra Fine) Clamp-on Sanding Sheets include break-through innovations that improve performance, extend sanding life and increase productivity. These sanding sheets are designed for use in 1/4 sheet palm sanders and are ideal for all types of wood, metal and plastics. Premium aluminum oxide blend - a superior quality formulation designed for fast material removal and long sanding lifeClog-Shield - high performance separate coating that reduces pitch build-up and clogging for maximum productivityEndura-Bond, a specialized high strength resin provides superior grit-to-backing bond for extreme durabilitySpecialized, high-strength Endura-Bond resin forms a reliable bond between backing and gritRecommended use - final sanding and surface preparation for stain/varnishTool usage - 1/4 sheet palm sandersMaterials - wood, metal and plastics