<b>Heavy duty custom bolt</b></br> <p>Large, strong custom bolts  can support   tree house beams with only  one puncture   point in the tree. These  specialty tree   house fasteners (known as  TABs or GLs)   are worth considering if you  want your tree   house to last more than a  few years, you   want to keep tree damage to  a minimum   and the tree house you're  building is large. </p>
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