https://alexnld.com/product/drillpro-m35-cobalt-drill-bit-set-hss-co-jobber-length-twist-drill-bits-with-metal-case-for-stainless-steel-wood-metal-drilling/?hilite="Drillpro 6.35mm Hex Shank HSS 4241 Titanium Coated Spiral Step Drill Bit For Hole Drilling Metal"