Carr Lane CLM-00-SCB | 12mm Diameter Steel Construction BallConstruction Balls Shoulder Type Precision tooling ball used as a reference point for critical inspection, layout, and machining operations. Shoulder type has a precision height reference shoulder to locate the ball in three dimensions. Concentricity between ball and shank is . 0002" TIR. The 12mm ball size is in steel and stainless steel. Made in USA. Application Information Shoulder Type Construction Balls provide a reference point in three