Thunderbolt 48-89-2317 Jobber Length Drill, 5/16 in Dia x 4-1/2 in OAL, Cobalt, 3-3/16 in Flute

About the Thunderbolt 48-89-2317 Jobber Length Drill, 5/16 in Dia x 4-1/2 in OAL, Cobalt, 3-3/16 in Flute

The Milwaukee 48-89-2317 model 5/16" Thunderbolt Cobalt Drill Bit is a part of the Cobalt Drill Bits Series. This cobalt bit is made for extreme durability and long-life. It gives you a thicker core than a standard drill bit, and its specially made parabolic flute form clears chips and debris fast.