M1.4x0.3 Thread shank , 0.080" Diameter Ruby Ball,1/2" length. Ruby ball tip for light weight, wear resistance, stability with changes in temperature, suitable for delicate and silicon carbide surfaces, and non-magnetic and non-conductive properties for use in Electrical Discharge Machining (EDM) processes. Compatible for Brown & Sharpe Bestest Dial Test Indicator . Package Include: 1 Ruby contact point. M1.4x0.3 Thread shank , 0.080" Diameter Ruby Ball,1/2" length.