Bosch EXPERT 6 Piece Self Cut Speed Flat Wood Drill Bit Hex Shank 13 - 25mm Bits The Bosch Expert 2608900333 SelfCut Speed Spade Wood Drill Bit is ideal for making fast holes in softwoods, chipboard and particleboard, such as drilling single studs for cabling or dowel installation on railings. It has an advanced paddle design that delivers extra speed for drilling into wood. On top of this, its Bosch patent threaded tip draws the spade bit into the wood with only light pressure, making it useful in tight spaces. What's more, it is perfect for electricians since it is convenient when drilling through blind holes for cabling, dowels and other hardware installations. 6 Piece spade bit set self cut set including 13, 16, 19, 20, 22 and 25mm flat bits for wood. Features Extremely fast.