Professional nail mushrooms tire drill , made of authentic carbonized steel, durable, and is produced by a fine scale blade process. 

It is three prism design, anti slip, with advantage of tough and sharp. fine workmanship, polised by multi-layer process, and the bottom trangular frosted treatment .

There are sizes: 3mm, 4.5mm, 6mm, 8mm,10mm, 12mm.