The UniPower is a single-speed winch that combines the advantages of a low-profile manual winch with the power of a 12- or 24-volt, low-amp-draw motor. What makes it unique is that the motor is partially imbedded inside the drum, so that it extends only 105 mm (4 1/8 inches) below the winch basea critical feature for small boats where space under the cabin top is limited. Composite roller bearings reduce friction under load and dont require lubrication. Gears are 17-4PH stainless steel for strength and durability. Harken recommends the single function digital switch DSSBK and circuit breaker HCP1717. Sold separately. MaterialAluminum  ConfigurationSelf-tailing  Speed1  Drum Ø (mm)110 mm Drum Ø (in)4 3/8 in Base Ø (mm)190 mm Base Ø (in)7 1/2 in Height (mm)215 mm Height (in)8 1/2 in Line entry height (mm)100 mm Line entry height (in)3 15/16 in Minimum line Ø (mm)8 mm Minimum line Ø (in)5/16 in Maximum line Ø (mm)14 mm Maximum line Ø (in)9/16 in Fastener circle (mm)160 m