TECHNIKS 7/16" SUPER PRECISION ER32 COLLET .0002 ACCURACY CNC CHUCK MILL Our Part # TEC-04232-7/16 The most accurate ER32 collet in the industry- average 0.0002 Total Indicated Runout (T.I.R.) Clamping Range .398-.437 Precision ground and hand inspected. Only the very best materials and grinding techniques used