When using, must use first impact electric drill, hammer drill on the fixed body size of the hole, and then put the bolt expansion pipe into the hole, can tighten nut bolt expansion pipe installation piece and the fixed body lhe swelling between the expansion of the tight will become an organic whole, bolt tail has a big head, bolt set outside a slightly larger than the diameter of a bolt circle tube, and the tail part that has a few openings, when after the bolt is tightened, the bulk of the tail was brought to the opening of the pipe, the pipe burst, achieve the purpose of expansion, and then put the bolt fixed on the ground or walls, achieve the purpose of rooting
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