To provide an exclusive tool which can be safely and stably applied to works at a work site, and can surely remove a cylindrical sleeve made of card boards.

A main shaft 1 is provided for the head of a handle 2, and a hammer slide shaft 3 is provided for the upper part of the handle 2. A hammer 4 capable of being freely moved along the hammer slide shaft 3, is provided, and a hammer slide stopper 5 is mounted to the end of the hammer slide shaft 3. Namely, let the main shaft 1 be held in a cylindrical sleeve made of card boards, which penetrates through the structural body of a building, let the main shaft 1 be fully inserted into the depth of the aforesaid cylindrical sleeve by tapping the hammer 4 while the hammer is being moved along the main shaft 1, and the cylindrical sleeve made of card boards penetrating through the structural body of the building, can thereby be taken out by rotating the handle 2.