M2 stylus with 3.0 mm diameter carbide cylinder and 3.0 mm diameter x 5.0 mm long stainless steel base. Stylus length to ball center is 22.5 mm. Stylus weight is 1.89 grams. Compare to Renishaw A-5003-1258. Cylinder styli are used for probing thin edges, like those found on stampings and sheet metal. They are not suitable for high accuracy work because the form of a cylinder is not as precise as a sphere. Please contact Q-Mark with any questions about calibrating or using cylinder styli.