Contact Points For Dial Test Indicator 2mm Diameter Ruby Ball 44.5mm Long. 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 Compatible for Mitutoyo dial test indicator :513-415-10，513-215N，513-215F，513-215FE，513-415，513-115，513-515，513-477-10H etc。 M1.6 thread shank.
Diameter ø2.0mm Ruby Ball, 44.5mm long
Material:Ruby ball.
Package Include: 1 contact point