Bosch ROS20VSK Variable Speed Palm Random Orbit Sander Kit, 5"Twist off dust canister is durable and compact, shows dust level, and easily detaches. Bosch microfilter system is the optimal on board system for filtering fine dust and can trap particles as small as a 1 2 micron in diameter. Hook Tight hook & loop disc attachment includes over 35,000 long life hooks ensure firm grip of disc, up to twice the standard number of hooks. Random orbit sanding action combination of pad orbit and rotation deliver well