Drilling Tool

4. Drilling tool

4 : 1 Perspective

4 . 2 : Front

4 . 3 : Back

4 . 4 : Right

4 . 5 : Left

4 . 6 : Top

4 . 7 : Bottom

4 . 8 : Enlarged

4 . 9 : Partial enlarged view of broken line rectangle in fig. 4 . 2

With the exception of the broken line rectangle in figure 4 . 2 which illustrates a partial enlarged view, the broken lines in the reproduction illustrate portions of the drill bit that form no part of the claimed designs; the dot-chain lines illustrate a border of the claimed subject matter and form no part of the claimed design.