Abstract: The disclosure relates to a one-piece masonry dowel, pin or peg (10) for fitted implantation in a bore having an internal enlargement (24), a tool (31) for and method of making the enlargement (24), and a tool for implanting the peg in the bore. The peg (10') consists of a sleeve (11) with internal threading (21) for a fastening screw, the leading part (14) of this sleeve having a plurality of thickened segments of a cylinder separated by axial slots, and the outer diameter of the cylinder made up of these segments being variable in such a way that the sleeve can be pushed into a bore and snapped into an enlargement in this bore. The leading part (14) of the sleeve (11) is integrally provided at the end thereof which leads in the push-in direction with an extension (19) which is likewise divided longitudinally into segments and the outer diameter of which in its relaxed condition corresponds to that of the unslotted annular part (12) of the sleeve (11).

Abstract: A drilling tool adapted to produce a radial enlargement along a cylindrical elementary drilled hole in concrete masonry. The tool comprises at least one cutter which is mounted in a slot in a drill sleeve which enters the elementary drilled hole, this cutter being held so as to be fixed in the peripheral direction and axially but movable radially by an inner spreader element, provided with chamfered surfaces, which is movable axially relatively to the drill sleeve. This spreader element is in one piece with the shank, which is directly rotatively driven, is movable axially relatively to the drill sleeve and is close-fitted therewith in the peripheral direction. The end of the drill sleeve projecting out of the elementary drilled hole is connected to an abutment piece which determines the location of the radial enlargement along the drilled hole.