Cheap And Discounts 15.1mm 15.2mm 15.3mm 15.4mm 15.5mm HSS Reduced Straight Crank Twist Drill Bit Shank Dia 12.7mm 1/2 inch 15.1 15.2 15.3 15.4 15.5 Wholesale. Buy Directly From Merchant AsiaTools Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.