This 4mm ER11 collet is made with the best materials and grinding techniques available, ensuring supreme accuracy with only 0.0002" Total Indicated Runout. Its precision-ground body undergoes thorough hand inspection for absolute reliability. The package includes one collet, providing you with the ideal tool for your CNC milling needs. 4MM SUPER PRECISION ER11 COLLET CNC CHUCK MILL It’s brand new, Great quality & high performanceFeatures:The most accurate ER11 collet in the industry- average 0.0002” Total Indicated Runout (T.I.R.) Precision ground and hand inspected. Only the very best materials and grinding techniques used Package Contents: 1 X 4MM SUPER PRECISION ER11 COLLET ACCURACY CNC CHUCK MILL