Bisco Tool Supply has for Sale High Speed Steel Numbered Size Long Drill Bits. These Drills are Perfect for Drilling Metals. Bisco has no minimum order and fast shipping. This #1 Extra Long Drill Bit is a 6" Extension Bit made of high speed steel also available in cobalt. Bisco Tool Supply is your Source for Numbered Extra Long Drill Bits in Number Sizes. Call the friendly sales staff at toll free 1-866-247-2635 today for your industrial supply needs.