Check the listing for details. Cmm Touch Probe Stylus, Ruby Ball Stylus for CNC Probe Renishaw OMP40-2 OMP60.... Condition: New, Made in China. Listed at 46.95 USD. Use for OMP40-2 OMP60 RMP60 RMP600 probeMaterial quality： Ruby ball Tungsten carbide RodThread: M4Spherical diameter：3mm(0.08i)nlength：50mm(1.97in) Product Description Ruby Ball Stylus For CNC Probe OMP40-2 OMP60 Renishaw A-5003-4797 The direct measuring needle is suitable for detecting simple features that can come into direct contact with the measured surface without obstruction. Tungsten carbide measuring rods have excellent rigidity, especially suitable for measuring needles with smaller ball and rod diameters. Dimension Thread:M4 A: 0.08in 2mm B: 1.97in 50mm C: 0.06in 1.5mm D: 1.58in 40mm Weight: 3.8g Material Ruby is widely recognized as the industry standard material for measuring needles and is currently one of the hardest materials available, suitable for most applications. Due to the presence of adhesive wear, it is not recommended to use a ruby probe when scanning aluminum workpieces.