THE PERFECT SANDING TOOL! A Favorite Among The Professionals When Blocking All Surfaces. Welcome to the Dura-Block Line! HIGH END PROFESSIONAL SANDING BLOCKS FOR SHOW CARS AND PERFECT FLAT FINISHES (THE BEST SANDING BLOCK MONEY CAN BUY). The Dura-Block and Dura-Scrub enhance any project you're working on. Dura-Block and Dura-Scrub are the ideal solution for Classic Car Custom Restoration, Boats, Planes, Trucks and anything project you're working on. This block is designed to allow the user to accurately block flat panels and panels with slight curves. Size: 1-3/8"H x 2-5/8"W x 11"L