The Professional version of Incra's patented T-Rule is shown here in the 6 inch/150mm version. This is the most versatile and precise rule Incra offers. These Professional T-Rules are also available in 12 inch/300mm lengths and both lengths offer Incra's patented marking holes at every 1/16th, 32nd, 64th &1/100th inch. But they are also bilingual because they have marking holes at every .5mm as well! The end features 3 vertical inches of marking holes at every 32nd. You will never be without the correct measurement with these beauties.