Carriage Mounted Carpet Poles High tensil steelLengths are usable lengthsCarriage mounts are available in ITA class II, III, and IVClass III Carriage Add-On +$50Class IV Carriage Add-On +$200 Standard ITA Class II Carriage Mount CLASS lll CARRIAGE ADD-ON +$50 CLASS lV CARRIAGE ADD-ON +$200 Other Diameters Are Available