Diablo Corner Contact 100-Grit (Fine) Sanding Sponge. Diablo's Premium Corner Contact Sanding Sponges Include Break-Through Innovations For Superior Sanding Performance, Extended Sanding Life And Increased Hand-Sanding Productivity. Featuring A Premium Aluminum Oxide Blend, These Dual-Edge Sanding Sponges Remove Material Faster And Offer Up To 3X Longer Sanding Life Versus Standard Hand Sanding Sheets. The Sanding Sponge's Angled Edge Creates Precise Edge And Bevel Profiles In Tight Corners And The Longer Length Allow For Sanding Medium Surface Areas. The Full Contact Design Provides Maximum Sanding Potential By Delivering Consistent Scratch Patterns And Ultra-Smooth Finishes. The Superior Grain Bonding System, ENDURA-BOND, Provides Diablo's Sanding Blocks With Longer Life And Extreme Durability.