Power Tec 91170 Step Drill Bit 4 30 mm in 2 Steps

2 mm steps. The step drill is a general multi use product, ideal for mechanics, panelbeaters and anyone involved in fabrication, it give the user the ability to increase the sizing of drilled or punched alignment holes accurately. 10 mm shank. HSS titanium-nitride coated to increase tool life. Spiral flute with edge breaker, self starter.