The steel prop is composed of inner tube, outer tube and adjustable nut, as bellow: 1. While in use, the inner tube on top and outer tube on bottom, the two parts are connected with bolt M10. 2.  The height of steel prop can be adjustable to meet different height requirement. As the sketch, there are a line of holes in the inner tube. While in use, adjust the position of inner and outer tube accordingly, and then insert the pin in the long hole of the adjustable nut on the outer tube. Through turning the nut, the pin will be fastened. The prop assembly finished. 3. While disassemble, turn the handle to loose the pin and put the inner tube in the outer tube. The steel prop is easy to operate and save contractor cost. This steel prop has standard outer shape, which is easy to transport and occupy less space. 4. Different size of steel prop can meet all kinds of site requirement and in this way there is no material waste. The steel prop height can be adjusted to reach different height requirement. Different size of steel prop can meet all kinds of site requirement and in this way there is no material waste. ¢

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