The basic Grid-Lign coupling consists of two steel shaft hubs, a high strength spring steel tapered grid element, two seals and a cover assembly. Misalignment and end float are accommodated by the sliding action of the grid in the lubricated hub grooves. Dodge Grid Coupling Hub, Type T10/T20, 1110T Coupling, 3-3/8 in Bore Dia, 6.31 in Hub Dia, 7/16 x 7/8 in Keyway, 2250 rpm Maximum, 5 in Length Through Bore, Steel