DUAL-CHANNEL AUTO VACUUM SYSTEM Our lijadora para drywall has a built-in vacuum system and the dual pipes channel design enable it achieve a strong dust vacuum efficiency which up to 97%-99% if operated properly. It helps you create a clean working environment and minimizes your cleanup work. Keeping the sand disc parallel to the wall will help prevent dust from leaking out. 8.5 AMP POWERFUL MOTOR & 6 GRID SANDPAPER This drywall tools is equipped with a 8.5 AMP pure copper motor and come with 6 grid sandpaper which provides strong power in sanding work and brings you an efficient sanding experience. The grid sandpaper is 3 times more durable and efficient than basic one. This means that 6 basic sandpapers plus 6 grid sandpaper equal 24 regular sandpaper, it is twice as much as other products on the market.