Drill Bits
From Amazon
KWB FORSTNER DRILL BIT SET, 5-PIECE FOR WOOD 15-35 MM WITH REDUCED SHANK, FOR HARD AND SOFTWOOD
Conrad Electronic
kwb 706090 Forstner bit set 15 mm, 20 mm, 25 mm, 30 mm, 35 mm 5 pc(s)
OnBuy
kwb 706090 Forstner drill set, 5 pieces for wood 15, 20, 25, 30 and 35-mm with twisted shank