3PC DURA-BLOCK H&LVAC KIT PACK, 5.25", 7" & 10.75" The new Dura-Block Vacuum Blocks, made with patented Dura-Block materials, are designed to eliminate any dust or sanding debris. The lightweight sanding block is designed for fast sanding on curved or flat surfaces and allows for a cleaner shop environment when used with a vacuum system. Highly efficient air passages and hole patterns minimize the amount of vacuum required to force the dust from the surface into the internal extraction system within the block. The built-in vacuum regulator allows the operator to adjust how much suction is needed . Dust Elimination Technology also increases abrasive life while keeping the work environment clean AF46D3