The E-Z Sander™ is a molded, high-impact 2-1/2″ x 6-1/4″ sanding block with side thumb wheels that advance internal plungers to put tension on a 2-1/2″ x 14″ wet/dry sanding belt. Reversing the thumb wheels loosens tension for replacing the belt. The E-Z Sander woodworking kits come with three wet/dry belts in 60-, 120- and 220-grit. It costs $19.99.