You can't trust just any collet with your tools when every micron matters. The Royal Ultra-Precision ER-32 Standard er collet set is made just for machinists that need perfect accuracy every time they use it. This precise collet has a guaranteed TIR of only 0.0002", which keeps your cutting tools true and gives you mirror-like finishes. It also extends the life of your tools, even on the most difficult CNC jobs.