Check the listing for details. CLE-LINE C22702 Jobber Drill,#12,HSS 4AF78. Condition: New. Listed at 2.66 USD. Jobber Length Drill Bit, Drill Bit Size #12, Drill Bit Point Angle 118 Degrees , High Speed Steel, Black Oxide, Decimal Equivalent 0.1890, Wire, Drill Bit Point Type Conventional Point, Non-Coolant Through, Number of Coolant Holes 0 Wire-size drill bits come in standard sizes that correspond to American Wire Gauge (AWG) sizes. The larger the wire size, the smaller the bit. These drill bits have a black-oxide finish that retains lubricants to improve the bits' wear resistance and chip flow. Black-oxide bits should only be used for drilling ferrous metals. The bits' spiral flutes evacuate chips as the bits drill into a workpiece, and their straight shank installs into a drill chuck or similar toolholder.Non-coolant-through high-speed steel jobber-length drill bits do not have coolant holes,.