Ductile Iron Capstan Head, 6,000 lb rating. These bayonet mount capstans are available in ductile iron and aluminum for extension shaft winches. They can be used for almost any pulling application using roughly any type of material. These capstan heads will fit on any 2 7/16` (62 mm) diameter winch extension shaft. The working surface is 7 1/4` diameter x 8` wide (184 mm x 200 mm). Also available is Altec***s 20` collapsible power reel with a max pull rating of 3,500 lbs. (P/N 415-01018) and ECR extension shaft (P/N 415-01067).