The drum support roller kit allows the dryer to tumble properly by supporting the drum cylinder. The kit includes two drum rollers, four tri-rings, and one palnut (or retaining washer). Dryer Drum Roller Set This set includes 2 rollers, 4 tri-rings, and 1 retaining washer. The drum roller holds the drum in place while the drum rotates on the support wheels. The tools needed to complete this repair are a putty knife, a Phillips screwdriver, and a 5/16 nut driver. This is an OEM part sourced directly from the manufacturer.