Because of its resistance to heat and stress, Cobalt Alloy bits turn faster without overheating. The 135° split point enables the drill to use less thrust and eliminates the tendency of the drill point to walk which makes these great for use in portable drills or drill presses. Cobalt Alloy bits will retain their edge sharpness longer than normal HSS bits, resulting in a significant saving of time and money in the workshop. We've assembled some fantastic money-saving sets here. All sets include a heavy-gauge steel index case for storing. Steelex Plus D2140 - Cobalt Alloy Drill Bits 1/16" - 1/2", 29 pc. Set