For sale is a Bux Model PG4 Electromagnetic Plate Clamp for use with hoists, cranes, etc. Built by Buck Manufacturing Co. in the USA. 1/60/120V, Single phase AC input. One hour on / one hour off rated duty cycle. On / Off switch. Approximately 8" diameter clamping (lifting) area of base. Approximately 26" overall height, including lifting eye. Several available. NOTE: One of these units does NOT have an indicator lamp.