CMT 537.000.05 5-Piece Forstner Bit set, 15-20-25-30-35mm Diameters, 8-10mm Shank - Drill Bits Cmt Forester Bit - Amazon.com
Steelex D3573 Forstner Bit Set with Hex Shank, 16-Piece - - Amazon.com
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