ຕັນໄມ້ອາເມລິກາ Double ມີ Hook ໝູນວຽນ TypeUS Type Woode BlockDouble Sheave BlockSwivel Hook BlockMarine Block DescriptionProduct: US Type Regular Wood Block Double Sheave with Swivel Hook, The body is lighter, and the hook is hot dip galvanized, so it could be used in Marine Operation .