Yellow Jackit 20 Ton Air/Manual Bottle Jack Screw on base. Chrome-plated pump piston and ram for added rust resistance. Extension screw gives added height when necessary. Return Springs for Faster descent. Minimum Height: 9-5/8. Max. Height: 19.2″/488 mm. Weight:from 20 Tons and up to 50 Tons. Extension screw gives added height when necessary. Meets ANSI/ASME PALD standards and CE/GS 10450 Yes -