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