"IRWIN" LEFT HAND DRILL BIT *3/16" *Jobber length *Black oxide or corrosion resistance *Heavy duty web construction forstrength and durability *135 degree spilt point *Begins drilling immediately minimizing bit walk *Recommended for use in mild steel, wood and plastic *Left handed drill bits are ideal for extracting broken right handed threaded studs and bolts *Replaces Ace no. 2198497