Abstract
A holder 1 has a shank portion 2 provided with a pocket 4 having the shape of a nearly rectangular solid. The pocket 4 is placed at a position relatively close to the tip of the tool. In the cross section of the shank, the pocket 4 has a width of 50% to 100% of the shank diameter or width, a height of 20% to 50% of the shank height, and a length of 50% to 250% of the shank diameter or height. A weight 5 is inserted into the pocket 4 such that the weight is movable but unable to rush out. The weight 5 has the shape of a nearly rectangular solid and is made of a material having a specific gravity comparable to or greater than that of the material of the shank portion.
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