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Mac Knows The DrillMac Tools has introduced their new and improved cobalt drill bit set, deemed by third party testing as the best drill bits in the industry. These bits are machined to exact tolerances and are available in 13-, 21- and 29-piece sets in three materials: cobalt, titanium and high-speed steel. The cobalt set is perfect for hardened steel and tough alloy applications. For more information contact: Mac Tools, Dept. LRM, 505 N. Cleveland Avenue, Suite 200, Westerville, OH 43082, (800) 622-8665, www.mactools.com.