#CNC Router Tooling. Every holder is individually tested for quality & accuracy and comes with a lab certification documenting accuracy and balance specifications. Balanced to 25,000 RPM Factory balanced to G2.5 at 25,000 RPM. T.I.R. 0.0001" Measured from taper O.D. to collet pocket I.D. Precision Collet Each collet is hand inspected for quality. T.I.R. only 0.0002". Power Coat Nuts Holds 40% tighter than bearing nuts, for best safety.