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Now, a user can choose one bit and drill into mild, hardened ... bits coated in titanium that offer protection but can deliver inconsistent performance, or cobalt bits that are limited to ...

The DeWalt 14-Piece Cobalt Alloy Steel Drill ... cobalt alloy bits are made for maximum durability and feature a pilot point design with a split tip that makes drilling through hard metals or ...

I'm trying to figure out which type of bit is best for drilling thru about 1/4" of galvanized steel. I recently used a standard carbon-steel bit to drill ... Cobalt steel<BR><BR>Looking at 1/4 ...

Moly drill bits work well with mild steel. Cobalt bits are expensive and best choice for the abuse common in farm shops, but…drill bits by definition are “consumable items.” The differences ...