Baileigh Industrial Manually Operated 3 Ton Ratcheting Arbor Press. 11" Maximum Opening 1 6 HP Air Inlet Size (in) 1 4 prisync722 Air Inlet Size (in) 1 4 Air Inlet Thread Gender Female Air Inlet Thread Type NPT Application Industrial Compatible Material Polyurethane Foam 1 4" NPT F X F X M 1 This sheet metal forming arbor press machine is a ratchet leverage machine that allows the operator to get the most leverage out of each pull of the handle using a ratchet actuator There is a rapid transfer flywheel that allows you to lift or lower the ram with great speed and it allows for small motions as well for set up before pressing the items at hand