Harken Size 70 Radial Self-Tailing 2-Speed Winch, Aluminum - 70.2STAHarken 70 Radial Self Tailing Aluminum Winch 2 Speed The Radial winch drum's gripping surface is shaped for each winch size and drum material and features diagonal ribs (rather than textured abrasive materials) to maximize gripping power and greatly reduce line wear. The self tailing mechanism on the winch means that one crew member can quickly and easily trim or raise sails. Specifications Gear Ratio 1 5. 70 Gear Ratio 2 18. 50 Power Ratio 1 22. 20