Tapping block including a body (3) surmounted by a hollow tubular collar (2) support with - a part (20) crural expansion with two slits (21, 21¿) extending in an axial plane, - one part (30) intermediate expansion with wall with gaps between the part (20) crural and the collar (2) support, characterized in that the wall portion (20) intermediate expansion is pierced, substantially in the extension of each slit (21, 21¿) of the part (20) crural, through an opening (31) of non-rectilinear expanding extending side to side of said axial plane and separated (22) axially of said slot (21, 21¿) for axially securing a double expansion of the dowel.
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