From inside (document excerpt):
Form No. 102753 Parts List & Operating Instructions for: 5110 Air / Hydraulic Floor Service Jack Max. Capacity: 10 Tons Application: Designed to lift a wide range of motor vehicles. This service jack is equipped with a manual foot and handle pump, along with an air-over hydraulic pump. 55 ” 171/8 ” 201/8 ” 33/8 ” TOP VIEW Rated Capacity: 20,000 lbs. Air Supply: 90175 psi Weight: 410 lbs. 73/8 ” dia.