These professional Sutton Tools HSS Viper Drill Bits represent the next generation of twist drill technology. The revolutionary 'Viper Bit' has a 118° split point design that is self-centring thus minimizing wandering when starting. This also reduces the amount of downward pressure required to penetrate the material. These Viper Drill bits are manufactured from European produced M2 High Speed Steel & are ideal for a wide range of materials including metal, wood & plastic. Drill sizes above 3/8" feature reduced shanks to suit 10mm drill chucks. Sizes included in this 25 Piece Set are 1/16 right up to 1/2" in 1/64" increments.