100% Brand new and high quality 10pcs carbide micro drill 0.3-1.2mm Drill has a large scraps discharge space, little resistance and smoothly during the scraps discharge. Use high quality materials and fine grinding process makes bit more sharp cutting edge, reduce cutting force and broken drill, improve the quality of hole wall. The cutting edges strictly avoid partial hole, ensure the quality. Shank diameter: approx. 1/8"" (3.175mm) "