Carr Lane CL-1-SCB-S | #6-32 Thread x 1/2" Diameter Stainless 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 Stainless Steel Material Heat Treat