"The Wesco Superwheel Attachment for the StairKing Battery-Powered Appliance Truck sold separately offers better mobility over rough surfaces. Installs in seconds and is equipped with 10in. x 4in. 4-ply pneumatic tires. Provides 4-wheel support and eases transport over rough surfaces. U.S.A. Tire Type Pneumatic, Compatible With Northern item# 144323, Tire Size H x W in. 10 x 4, Height in. 5, Overall Width in. 21."
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