Factory-Reconditioned Bosch ROS20VSK-RT 120-Volt Variable-Speed Random-Orbit Sander Kit Reconditioned Bosch Products have a One-year warranty through the Bosch factory or an authorized service center Twist-Off Dust Canister - Durable, compact canister shows dust level and easily detaches. Bosch Microfilter System - Optimal on-board system for filtering fine dust. Traps particles as small as a 1/2 micron in diameter. Variable-Speed Dial - Allows match of speed to workpiece and task. Anti-Spillback Canister Design - Minimizes dust spillback into sander.