Harken SINGLE SPEED ALUMINUM WINCH. Description Single speed – aluminum. Gear ratio - 1 1:1. Power ratio - 1 8.4:1. Fastener circle (in) 2-9/16. Fasteners (in) 6 x 1/4 FH. Drum dia. (in) 2-3/8. Base dia. (in) 3-9/16. Height (in) 3-1/4. Weight - alum. (lb) 1.6. Line entry height (in) 1-5/16.