20 Self-Tailing Radial Aluminum WinchThe 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: AluminumConfiguration: Self-tailingSpeed: 1Drum: 2-7/8 inBase: 5-3/8 inHeight: 5-13/16 inWeight: 5.3 lbsLine entry height: 2-3/8 inMinimum line: 1/4 inMaximum line: 1/2 inFastener circle: 4-3/8 inFasteners: 1/4 SH inNumber of fasteners: 5Gear ratio -1: 2.76Power ratio - 1: 19.20Available power: Manual