4 Wire Gauge Drill Bits Jobber Length Numbered Drill bit. Wholesale Bulk Drills. Drill Bits made of High Speed Steel are for sale by Bisco of Florida. 4 Numbered Drill Bits in Wire Gauge Sizes have a .2090 Decimal Equivalent, 2-1/2" Flute Length, and 3-3/4" Overall Length. These wholesale number drill bits are designed for drilling a broad range of materials in the steel and iron families. Wholesale Numbered Drill Bits are surface treated with abrasion-resistant black oxide.