... price 5.Bright finished Step drill with spiral flute1.) Step drill bits 2.) Spiral flute 3.) Step drill, bright finished ... and holes are deburred automatically by the following step.*Suitable for drilling in alloyed and non alloyed ... and holes are deburred automatically by the following step.*Suitable for drilling in alloyed and non alloyed ... ,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm105mm156-38mm6,9,13 ...