I enjoy woodwork and housework and most of my work as a car mechanic. Fixing my own stuff is a pleasure when I have the right tools at hand. I finally made the right move! I've looked at countless step nozzles and they're not very effective on anything but soft sheet metal. On the other hand, it is DONE RIGHT! It uses M35 high speed steel with 5% cobalt (HSS-Co) to allow drilling in stainless steel (use lower speeds to 550) with good lubrication like EVO DYNE cutting fluid. And it has a tri-flat shank to prevent the bit from spinning in the chuck. Hooray! Dual flute helical design contributes to better chip/chip removal during drilling. The beat is sharp and every step is marked. It has its own plastic box. It's not a cheap bit, but it's time for a quality HSS-Co step bit. Cheap step drills are a dime a dozen and should not be used. I highly recommend this NordWolf M35 Cobalt Step Drill with 3-point drill bit, spiral flute, triangular shank, two-tone, 13 steps from 3/16" to 1-3/8". ". Great tool when I needed to enlarge a hole in sheet metal in SS! I hope you found the information and my review helpful.