BEST OVERALL: DeWalt Industrial Cobalt Alloy Steel ... are durable and will hold up much longer than standard high-speed ...

Higher RPM drills can drill into harder materials, such as masonry and metal and can handle larger drill bits. Many DeWalt drills have two or three speed settings ... tier and high end drills ...

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 ...