The Vortex series of drill bits from Norseman have a few unique features that you may find helpful in your install and fabricating work. The most noticeable feature of the bits it the point. The step shank point serves a few purposes. First off the shape reduces friction and thus heat which increases tool life. Norseman is claiming the bits can last up to four times longer than standard bits. The tip is also useful when enlarging existing holes. The bit will center nicely and drill through without damaging the tip of the drill bit. The step on the smaller bits, say 1/8″ and under is hard to notice so not sure if it is a benefit at the smaller size. The Norseman Vortex Drill Bits are recommended for cast iron, brass, sheet metal, acrylic, mild steel, copper, and hard steel. I have heard from a few of our customers that the bits do a nice job on stainless steel as well.