Advantages: Rapid drilling of precisely dimensioned, deep-cut holes in wood (e.g. rafters, beams) Independent feed with minimal energy expenditure with feeder thread Tear-out-free cutting edge thanks to taper tap Long service life with hardened spirals Rounded and deep chip fluting without core speeds up the drilling progress with low energy expenditure and optimises chip discharge Composition of set: Dia. 12, 14, 16, 18, 20, 22 mm