1) No need for a pilot hole <br><br>2) Titanium coated to reduce friction and run cooler <br><br>3) Large bit has 3 sided shanks <br><br>4) Automatically backs holes as you drill <br><br>5) High speed steel? durable <br><br>6) Widely used to cut holes in a variety of material like steel? wood? thin iron? aluminum alloy? insulation boards? PVC sheet <br><br>7) Specification: <br><br>1. 4-32mm (4?6?8?10?12?14?16?18?20?22?24?26?28?30?32 mm) 10mm shank <br><br>2. 4-20mm (4?6?8?10?12?14?16?18?20 mm) 8mm shank <br><br>3. 4-12mm (4?6?8?10?12 mm) 6mm shank