Expansion anchor unit

摘要: An expansion anchor unit has a first member leading portion of which is provided with cutter edges for drilling hole in support structure, and trailing converges direction away from the portion. A second forward end matingly engageable member, rearward by tool operative jointly rotating both members sense effecting structure edges. The may itself be configurated as an to expanded after latter drilled or additional which, disengaged removed hole, inserted into forcibly wedged contact same.