This is the same size and strength as the Mechanical 301 with hydraulic looking action to increase work capacity to 150 pounds. Hydraulic system is hand operated, self contained and sealed with replaceable cups. Mounting holes are 5/16"-18 on center. Weight 15 pounds, base diameter 5 7/8" and overall height is 7". Rated for heavy-duty assembly, welding, maintenance and tool room work.