1pc Mayitr HSS Auger Twist Drill Bit Set 2/3/3.5/4/5 mm Diameter160mm Extra Long Straight Shank Drill Bits for Electric Drills 10pc twist drill bit set hss m35 co for metal stainless steel iron aluminum 1 5 2 2 5 3 3 2 4 4 5 5 5 5 6 6 5mm power tools