Harken 20 Self-Tailing Radial Aluminum Winch [20STA]20 Self Tailing Radial Aluminum Winch 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: Material: Aluminum Configuration: Self tailing Speed: 1 Drum: 2 7 8 in