![]() ![]() The Grizzly Customer Service and Technical Support Teams are U.S. ![]() HSS (high-speed steel) has been heat treated for hardness and wear resistance, which keeps a sharp edge longer than other carbon steels. The T31990 33-piece set includes bits ranging from 33/64" to 1" in 1/64" increments. These stepped drill bit shanks fit 1/2" drill chucks, measure 6" overall in length, and come in a fitted, aluminum case. These bits are made with 5% cobalt and can be used at much higher speeds than HSS drill bits. ![]() You’ll want the 33-piece T31990 HSS/Cobalt Silver
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