Winch Single Speel Aluminum. Description Single speed – aluminum. Gear ratio - 1 1:1. Power ratio - 1 7.3:1. Fastener circle (in) 3-9/16. Fasteners (in) 4 x 5/16 FH. Drum dia. (in) 2-3/4. Base dia. (in) 4-1/2. Height (in) 3-9/16. Weight - alum. (lb) 2.3. Line entry height (in) 1-1/2.