1.Lets see from the sketch drawing, to mount a hoist to a H steel, you need a hoist trolley mechanism as marked in the sketch above which is included inside the package we quoted, let’s see the real object below:
2.The mechanism includes three parts: A. the driving mechanism; B. Supporting wheels. C. Rigid Bolts.(2 pcs), see picture below;
3. Hung the driving mechanism and supporting wheels on the under flange of the recommended H steel, like this: and adjust the screw to a proper position so that the WHEELS could the run on the H steel flange smoothly.

4. The bolts are used to lock the hoist trolley to the H steel as well as to carry the hoist through the locking point:
Like this:
5. The complete hoist set we quoted to you includes: