Neiko10184A Titanium Step Drill Bit, High-Speed Alloy-Steel Bit, Hole Expander for Wood and Metal, 9 Step Sizes from 1/4 Inch to 3/4 Inch

We were working on a craft project that required holes through small sheet metal covers to mount solar lights. The holes were 11/16 inch diameter and these step bits cut a nice, clean round hole in the metal. The bits have angled shafts to prevent rotation in the drill chuck, and seem sturdy and sharp. For cutting something thicker, like wood, I think it would work easier to see clearly when the various step levels occur, because you have more resistance. But overall these worked great for our project, and a new addition to the variety of drill bits we need and use around our DIY projects.

He estado haciendo unas repisas de metal y me han servido muy bien estas brocas cónicas. No espero que duren una eternidad pero hasta ahora han aguantado bien. Unos 50 hoyos en PTR calibre 14. En cada perforación le pongo a la broca un chorrito de WD40 pa que me ayude a que no se caliente tanto y pierdan el filo.

Perforé más de 50 orificios para colocar pernos de 1/2" en acero de 1/8 y la broca aún está afilada y corta nuevos orificios

Much better than expected

Have used these to drill out stainless allan key studs. With the appropriate drilling fluid, they were drilled out with ease. Very happy!