This Drive Pipe Adapter Sleeve is used to transition the 2 3/8″ output on a Flat Plate Hoist to the standard 1.5″ drive shafts found on pile mount boat lifts. Inside diameter of 1 15/16″. Wall thickness SCH 40. Made from Marine Grade 6061-T6 Aluminum. Pre-drilled for the Flat Plate drive bolt. Measures 9 inches long.