Andersen Patio Door Tandem Roller 1997061 (2 Pack) 2 Pack Gliding door tandem roller assembly with bracket. Dual ball bearing 1 1/4" rollers. Andersen rollers provide smooth gliding operation with self-contained leveling adjusters. When replacing rollers, we recommend replacing both rollers. Priced in Pairs, Sold as a Pair of tandem rollers. One door uses two tandem rollers.