Patent ID: 6960049

Claim:
An insert comprising: a clamping member; and a parallelogram shaped body that is detachably mounted by said clamping member on a tip mounting face of a holder, wherein two or more concave grooves are formed like parallel stripes on said tip mounting face of said holder; two or more convex lines are formed on an abdominal face of said parallelogram shaped body to be fitted in said concave grooves of said holder; said parallelogram shaped body is clamped by said clamping member to said holder so that the convex lines are fitted in the concave grooves on said tip mounting face; said clamping member fixes said parallelogram shaped body to said holder by tightening a clamp screw through a screw insertion hole of said parallelogram shaped body into a female thread hole on said tip mounting face; and a flat convex line missing part is provided in a region of said parallelogram shaped body which includes a periphery of an opening edge of said screw insertion hole and is opposed to said tip mounting face of said holder when said parallelogram shaped body is fixed to said holder, and wherein said tip mounting face and said flat convex line missing part are out of contact at least before tightening said clamp screw, and wherein said flat convex line missing part is flush with a base of said convex lines.