Unlike any heavy-duty clutch jack on the market today, Gray claims its model HR-300's unique design will allow the technician the flexibility to work under four post lifts or mobile column lifts. This new Hi-Rise Clutch Jack features, 300 lbs capacity, two-stage design, first stage air operated for speed and second stage hydraulic powered for accuracy, starting height of 38-1/2" and maximum lift height of 79".