This is a VRP Pro Metric Shock Piston Drill Set, featuring drill bits between .85-1.85mm in increments of 0.05mm. We have these sets special made to have the correct range of the most common drill sizes used in rc pistons. The set comes with a drill bit holder box that has a color-coordinated label so you can quickly figure out the drill bit sizes to keep them in order.
These Drill Bits are made in Japan.
We also sell the drill bits separatley.