A counter drill bit set made of high-speed steel is of better quality than carbon steel drill bits. This countersink bit set comprises a mixture of molybdenum or tungsten and alloy metals and can ...

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 drill bit without reacting with the brass.

There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits, hole saws and annular cutters. 1. Twist drill bits. Especially in steel thicker than ...