... price 5.Bright finished Step drill with spiral flute1.) Step drill bits 2.) Spiral flute 3.) Step drill, bright finished 4.)HSS ... speed and faster dust rejection.1.) Step drill bits 2.) Spiral flute 3.) Step drill, bright finished 4.)HSS steel 5.) ... 6,8,10,12,14,16,18,20,22,24,26,28,30,32mm105mm156-38mm6,9,13,16,19,21, ... 23,26,29,32,35,38mm100mm126-40mm6,11,17,23,29, ...