Patent ID: 8708617

Claim:
An internal groove insert, comprising: a rectangular main body having a top surface, a lower surface, first, second, third and fourth lateral surfaces formed in a counter-clockwise direction when seen from a top view; a clamping hole passing from said top surface to said lower surface, the clamping hole having a first central axis; and first and second projections each projecting from adjacent first and second lateral surfaces, respectively; wherein said first projection has a first cutting edge on its end portion at a side of the top surface of the main body, and said second projection has a second cutting edge on its end portion at a side of the lower surface of the main body; wherein said first and fourth lateral surfaces are inclined by an obtuse angle with respect to the top surface of the main body, said second and third lateral surfaces being inclined by an acute angle with respect to the top surface of the main body; and wherein the first central axis of said clamping hole is formed to be parallel to an insert corner edge where the first and fourth lateral surfaces meet.