High Speed Steel Drill Bits
High Speed Steel Drill Bits
Aircraft Extension HSS Drill Bits
Aircraft Extension HSS Drill Bits
Aircraft Extension drill bits are similar in length to extra length bits, emphasizing reach over cutting depth, and have a shorter flute length (about the same as a jobber drill). This makes the bit much stronger and less susceptible to bending and breaking.
Extra Length HSS Drill Bits
Extra Length HSS Drill Bits
Extra Length Drill Bits are designed for general purpose drilling where extra reach is needed. Extra length drills can be very fragile and easily broken so it's usually best to drill as deep as possible with a jobber or shorter bit before switching to an extra length drill bit.