3-12mm 4-12mm 4-20mm 4-32mm HSS Straight Groove Step Drill Bit Titanium Coated Wood Metal Hole Cutter Core Drill Bit
https://www.vogueparade.com/shopping/EN/100006468/1/1005003389485380/3-12mm-4-12mm-4-20mm-4-32mm-hss-straight-groove-step-drill-bit-titanium-coated-wood-metal-hole-cutter-core-drill-bit//