43 Thunderbolt® Jobber length drill bit with 3/8-Inch reduced 3-flat shank, is ideal for general-purpose drilling and to cut metal, wood or plastic. It has 4-1/2-Inch pa73olic flute with 135-degree split point to drill and remove drilled out material. It measures 6-Inch x 1/2-Inch Dia. This drill bit comes in black oxide finish. The thicker web of this drill bit offers better strength and life.