For Single and Bi-Parting doors up to 100 lbs. System has four free-rolling nylon wheels mounted on pivoting track. Each door therefore, rides on eight wheels. Skipping or jumping is impossible. The ball-and-socket suspension compensates for minor header misalignments. Hangers are secured by vibration proof stop nuts. Door of any thickness from 3/4" can be accomodated.Mounting: TopAdjustment: NoneDoor Thickness: 3/4" and upHeadroom: 1-15/16"
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