Designed to be used with an impact wrench for quick cylinder liner removal. The spring loaded puller arms automatically adjust to fit the liner for a fast set-up time. The low profile of this tool allows work in areas where space is limited. The tool accommodates bore diameters from 3-7/8" to 6-1/4", sleeve depths to 15", and liner wall thickness of 0.273" min. Drive screw hex size; 1-1/8". Works on select Mack, Volvo, Detroit Diesel, International, Cummins, Navistar and other Caterpillar engines. Similar to Porta-Tool OE tool number PT-6400-C.