The flexibility inherent in their on-site machining and assembly facilities, together with factory Special Execution Programs, allows the specifier to choose from a wide spectrum of custom and semi-standard options. These include special bearing and lubrication systems, special commutation and brush systems, special coil voltages, extended temperature range versions, custom leadwire lengths and materials, and shaft configurations and thru-shafts of many diameters and lengths (including hollow shaft motors). Motors and gearhead assemblies for vacuum operations, space, down-hole drilling and logging, industrail line, wireless communication, environmental measurement, and other narrow applications niches are also available.