While HSS is a common base for a variety of drill bit types, it's important to note that there are different grades of HSS, and cheaper drill bits often contain ... 12 Woodworking Tools Under $20 ...

Used in a hand drill, it's not hard to break through the coating and then you just have a plain HSS bit.<BR><BR>I've used cobalt bits to drill the case hardened head on allen bolts for safety wire ...