Amazon.com: Forstner Bit Set, Wood Drilling, w/Carbide Tipped 8 Piece Set by KOWOOD : Industrial & Scientific
KWB Powerbox wood and Forstner drill set 5, 6, 15, 20, 25, 30, 35, 40 mm diameter 706078 (set of 8 pieces forged drill bits in accordance with ISO 7483 G) - - Amazon.com