CMM Styli M3 Thread 4mm Ruby Ball Tip Ceramic Stem L50mm Compatible A-5003-0068 Product description: Straight styli are designed to inspect simple features where direct, unobstructed contact with a measured surface is possible. Ruby is regarded as the industry standard for stylus tips. It is one of the hardest materials available and suitable for most applications. Ruby provides a long life without wearing of the surface from abrasive materials. Thread Size:M3 Stem Material:Ceramics Ball Material:Ruby Ball Diameter:4.0mm Overrall Length:50mm Effective Work Length:46.0mm Stem Diameter:2.0mm Package:1pc