M4 Threaded Styli Straight styli are designed to inspect simple features where direct, unobstructed contact with a measured surface is possible. A ceramic stem is lightweight yet very stiff and offers built-in crash protection. Ruby is regarded as the industry standard for stylus tips. It is one of the hardest materials available and suitable for most applications. NOTE:It is a substitute, compatible with Renishaw A-5000-7796 Specification Ball material:Ruby Ball dia. mm (in.):8.0(0.32) Length mm (in.):100.0(3.94) Stem dia. mm (in.):4.5(0.18) EWL mm (in.):100.0(3.94) Package:1pc