... price 5.Bright finished Step drill with spiral flute1.) Step drill bits 2.) Spiral flute 3.) Step drill, bright finished 4 ... 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 ... 14,15,16,17,18,19,20mm88mm11 Step drill with spiral flute