ITEM NAME:50Pcs/set 0.5-0.9mm Tungsten Micro Drill Bit Engraving tool for PCB Newest Use.ï ¼Ë†2ï ¼â€°Ã£â‚¬ High Precision】 With sharp cutting edge, milling groove and clean surface, these sets of tool work quickly and cleanly, no glitches or scrap left.50pcs micro engraving drill in a set. Specifications:Material: Tungsten Steel + HSS.