Case Constructed of 100% Billet steel and the internals can be customized for your applications. All components designed for extreme duty, meeting mounting specifications of standard duty bearings of simular sizes. Designed to use socket-head cap screws for mounting, to meet the most extreme environments. Each unit is 100% rebulidable with off the shelf parts saving you down time and about 2 pounds of carbon for every 1 pound of housing weight, every time the unit housing is reused. You can also send it back to the factory for a complete rebuild using factory components for a fraction of the cost of new. Purchasing one of these units and rebuilding it reduses carbon emmissions for the planet.