To obviate a prepared hole, directly screw a fixture into a material, and provide with a firm pull-out prevention effect by threadly engaging a shaft with a male screw into a screw hole of an outer cylinder provided with a slit and a male screw from the tip point part to the end flange side and fixing the material to be fixed.

An outer cylinder 1 is provided with a male screw 1f in its outer circumference, a point part 1a in its tip, a flange 1b in its end, a bottomed hole 1c with a female screw extending from the end to its intermediate part, and a tapered face formed in the hole bottom 1d. A slit 1e in provided in such a state as penetrating through the center of the hole bottom 1d to the tip. A shaft 2 is provided with a point part 2c in its tip and a male screw 2d in its outer circumference, and when it is screwed from the end of the outer cylinder 1, the shaft 2 is made to stop by the outer cylinder hole bottom 1d, till the flange 1b reaches a material to be fixed, so that the outer cylinder 1 is integrally rotated with the shaft 2 and entered into the material to be fixed. When the flange 1b reaches the material to be fixed, the entering of the outer cylinder 1 is stopped, the slit 1e part is opened, and the shaft 2 is screwed into the outer cylinder 1. The opened part of the outer cylinder 1 thus works as an anchor resisting to the pull-out force.