the tool is designed for sleeve depths up to 18 inches and bore diameters of 4 inches to 6 1/4 inches.Low profile for limited space bore diameters 4 inch to 6 1/4 inches sleeve depths up to 18 inches works on specific navistar vehicles the low profile of this tool allows work in areas where space is limited.the low profile of this tool allows work in areas where space is limited.