Installation The V groove wheel can attach to the sliding gate in different ways The thick mounting plate is designed for weld-on installation; the holes on the mounting plate are for bolt-on installation (1/4" bolts needed) ABOUT THE V GROOVE WHEEL Material The v groove wheel is built with solid construct, consistent quality and corrosion resistance It's made of high quality standard 45 # steel which is galvanized With sealed double 6000RS chrome steel ball bearings, it can roll smoothly and last long Load Capacity Each heavy duty caster allow load 650 lbs capacity, and all four casters easily carry up to 2500 lbs, supporting and rolling the heavy duty gate steadily [Roue rainurée en forme de U]: La roue rainurée en forme de U avec deux roulements à billes offre une plus grande flexibilité, lui confère des performances de glissement fluides et utilise mieux l'espace au sol disponible. [Percée révolutionnaire dans l'industrie lourde] : roulement de guidage robuste + support épais en