Brown & Sharpe 599-7034-80R Ruby Tip Contact Point for Bestest Dial Test Indicator, 0.080" Tip Dia. x 1-7/16" Length, M1.4 x 0.03 Thread Contact point for use with Brown & Sharpe Bestest series dial test indicators Ruby (synthetic sapphire) 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 M1.4x0.3 thread