Carr Lane CLM-7-SCB | M6 Thread x 20mm Diameter x 1mm Pitch Shoulder Type 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. Made in USA. Application Information Shoulder Type Construction Balls provide a reference point in three dimensions. Material Steel Material Heat Treat Finish DFARS