... with high precision and stability 4.Adapted for DIN6499B ER-40 COLLETSpot: Standard PartsMaterial: 60Si2MnSpecifications: 1.0,2.0,3.0 ... ,4.0,5.0,6.0,7.0,8.0,9.0,10Hardness: 48-55 HRCAccuracy: within ... -5.088.56.513.52.71.51.20.5ER111.0-7.01111.59.5183.82.520.5ER161.0-2.0161713.827 ...