Thunderbolt 48-89-2726 Jobber Length Drill, 5/16 in Dia x 4-1/2 in OAL, Cobalt

About the Thunderbolt 48-89-2726 Jobber Length Drill, 5/16 in Dia x 4-1/2 in OAL, Cobalt

The Milwaukee 48-89-2726 model 5/16" Thunderbolt Black Oxide Drill Bit is a part of the Black Oxide Drill Bits Series. This black oxide 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.