For drilling hard, brittle cast iron, the extra control afforded by the design of these bits was especially helpful. It takes ...

For drilling holes in steel that’s 1/8 in ... and prevent the drill bit from wandering as it bores through the sheet metal.

It turns out that a hot solution of alum (ammonium aluminum sulfate), which is available in the spice rack of your local supermarket, will dissolve the steel ... for larger drill bits, but the ...

There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits, hole saws and ... carbide-tipped hole saws can drill through metal that is up to ...

The tapered drill bits guarantee a stunning finish ... A countersink drill bit composed of carbon steel is ideal for drilling through wood or similar materials. However, if intending to drill ...

That said, there is both a drilling ... up to 11mm drill bits when tackling masonry work, so probably not great for producing holes big enough to run cables or stick your head through etc.