Forstner Bit Set, HPHOPE Forstner Bits for Wood, Wood Drilling with Round Shank, Drill Accessories, Ø15/20/25/30/35mm, 5 Pcs with Storage Case : Amazon.sg: DIY & Tools
DeWalt Rapid wood/Forstner drill, 117 mm diameter (suitable for use in drills, battery cable, for clean and accurate breakthrough holes in hard and soft wood, wooden floorboards, old building ceilings), DT4590 :