Do It Cobalt Drill Bit For Drilling Hard Metals 5/16 In Pack of 4

B4R3 B2(New) Do It 250381DB Cobalt Drill Bit, 5/16-Inch (Pack of 4)-------------------------------* Superior durability and speed for most general purpose drilling applications in wood, metal and plastic.* Triple tempered black oxide coating provides very high lubricity to reduce heat buildup and prolong the life of the bit.* Features a 135-degree split point for fast starts and minimal walking or skating.Features and further details-------------------------------* Industrial quality cobalt drill bits are designed for drilling in hard abrasive materials such as stainless steel and titanium.