Probe ER-008638 6mm Ball Centering Sensor Compatible With EROW New 
6mm Diameter Ball Centering Sensor compatible with EROWA 
Automatic measurement of workpieces in CNC EDM sinking centers
Accuracy:±0.002mm
Hardness:32-36HRC
Size:50*50*126mm
Material: Stainless Steel 420
Package:1pc