#1-60 ECONOMY DRILL Bit SET. Industrial Quality Drill Bits by Bisco of Florida. Very Small Numbered Drill bit. Wholesale Bulk Drills. Drill Bits made of High Speed Steel are for sale by Bisco of Florida. 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.