This drywall hoist, for 4' x 16' drywall sheets has a maximum load capacity of 150lbs and load height of 34". The maximum height that this unit can lift to is 11'. The cable size is 6 x 7 + ISW (IWS) with a 7 strand construction. The hoist comes with three 5" castors for easy movement. An extension kit is not available and this unit is not intended for contractor/commercial use.