Cheap And Discounts M35 HSS-CO Step Drill Bits 4-32mm metalworking Spiral groove 1/4'' hex Shank Stainless steel tapping Cobalt plating Wholesale. Buy Directly From Merchant Flash's Tool Crib. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.