"This Blackhawk Automotive air/manual hydraulic jack is protected from internal damage by patented bypass mechanism. Machined and polished cylinders with die-cut threads provide nonabrasive leak-free durable performance. Base L x W in. 7 1/8 x 5, Max. Lift Height in. 43 1/4, Min. Lift Height in. 24 1/8, Lift Capacity tons 8, Pistons qty. 1. Fabricated from hard-cast steel with heat-treated critical stress areas Unique cross-type forged release valve assures positive control Wide, rugged base for strength and stability Manual or pneumatic operation Uses standard shop air 110-175 PSI 7.8 CFM"