New SS-590 skid steer mixer from Worksaver has direct hydraulic drive of the gearbox, which eliminates chain and sprocket maintenance. A 11 cubic foot drum allows the operator to mix, transport and place 5 cubic feet of concrete. Design improvements over the SS-585 offers the contractor a cost savings over the SS-585, according to the company. All-steel welded construction of the drum with internal angled paddles allow for uniform concrete mixing and clean dumping.