29 Piece USA Made Black and Gold Drill Bit Set 1/16" - 1/2" by 64ths. Drill Bit Sets Industrial Quality at Wholesale Price. The drills are 135 degree split point, surface treated and jobber length. These USA Made Drill Bits are dependable, general purpose drills designed to perform in a broad range of materials including aluminum, iron, stainless steel and other hard metal drilling. Bisco Tool Supply sells a variety of sizes of Black and Gold fractional drill bits. Please call the Bisco Tool Supply sales staff toll-free at 1-866-247-2635 with any drill bit questions.