IDEAL® 35-515 Step Drill, 1/4 in Diameter Minimum Hole, 1-1/8 in Diameter Maximum Hole, 16 Steps, 16 Hole, 3/8 in Shank

IDEAL® step drill bits for precise, repetitive drilling through the toughest materials including brass, carbon steel, cast iron, stainless steel and more. These tough and reliable tools are constructed with a rugged titanium nitride exterior coating for protection, edge retention and corrosion-resistance. Each step is gradually blended to ease stepping through hole sizes; reducing the need to keep changing drill bits. Split point design eliminates the need for a starter hole or punch and delivers 3 times faster starts, saving valuable time. The double fluted design provides balanced cuts, more cutting surface compared to a single flute design and cooler operation.