Product details:

Constructed of high-grade steel for long lasting durability. Welded base and cylinder to assure strength and eliminate leaks. Meets ANSI/ASME PALD standards & CE/GS. Aluminum air motor. This 10446 20 Ton Air/Hydraulic bottle jack delivers exceptional performance. Chrome-plated pump piston and ram for added rust resistance. Extension screw gives added height when necessary. Unit is complete with Return Springs for Faster descent, comes with air hose. Lifting Capacity 20 Tons or 40,000 lbs. Minimum Height is 9.625(245mm). Maximum Height is 18.75(476mm). Weight is 35 lbs.