Durable and compact twist-off dust canister shows dust level and easily detaches. Features microfilter system for optimal filtering of fine dust and trapping particles as small as a 1/2-micron in diameter. Hook-and-loop disc attachment contains over 35,000 long-life hooks ensure from grip of the disc. The variable speed dial allows you to match the speed to work piece and task. Anti-spillback canister design minimizes dust spillback into sander.