Norseman/Viking Drill and Tool, 1 per pack, 5/16" 12", Type 212 135 Degree Split Point Welded Construction Extension Drill Bit. High Speed Steel 12-inch 135-Degree Split Point Heavy Duty Black Oxide Welded Construction Extension, 135-Degree split point for accurate centering and fast penetration. High speed steel provides good wear resistance, can be used in general purpose applications for ferrous and nonferrous materials. Black oxide prevents chip building, galling and welding. Commonly used for low carbon, stainless and ferrous metals. 12" OAL, 135-Degree Split Point (68920)