2" HSS FLAT BOTTOM TWIST DRILL BIT MORSE TAPER #5 SHANK 9 1/8 LOC 17" OAL 2.0 | eBay
10 Reasons to Use Flat Bottom Tools - In The Loupe
Size Expansion – Small Diameters Added to the MFE Solid Carbide Flat Bottom Drills for Counter Boring - New Products Information | MITSUBISHI MATERIALS CORPORATION