This reducer gearbox utilizes a double worm drive reducer. The BH-USA A-Drive boat hoists are equipped with this gearbox. A marine-grade finish is applied to the solid aluminum construction. Bronze-on-steel gears are used in the gearbox. Cast aluminum is used for the motor and drive pipe flanges. Throughout the double-worm reducer, stainless steel fasteners are used. To mount the drive pipe on the reducer gearbox, a hardened drive shafts required. They are not included with this gearbox. When the appropriate mounting plate is used, this gearbox can be used on both overhead boat lifts and pile-mounted boat lifts. Hardened output driveshafts are required to attach the direct drive boat hoist to the boat lift drive pipe.