Even when drilling the toughest materials, they can also maintain sharpness and durability. M42 High-Speed Steel Drill Bits M42 high-speed steel drill bits contain a high content of cobalt, so they ...

Cobalt bits are expensive and best choice for ... No matter what type of drill bit is used, drilling stainless steel builds intense heat quickly. If the drilling process is interrupted, the ...

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.

NRB’s high-tech polycrystalline diamond cutters (PDC) drill bits are designed for water, oil, gas and geothermal well drilling. Highly durable steel reinforced with polycrystalline diamond cutters ...