20100111627 | Indexable Insert for Drilling and Blank Insert Manufacturing Same - An indexable insert for drilling includes front and rear edges opposite to each other and having a rotationally symmetrical relation; and two side surfaces opposite to each other and having a rotationally symmetrical relation. Each side surface has first and second cutting edge portions formed thereon. The first cutting edge portion is disposed farther than the second cutting edge from the center of the blank insert, thereby providing a step between the first and second cutting edge. The first cutting edge is adjacent to the front edge. | 05-06-2010 |