To determine which Speed-Rail fitting is needed measure the outside diameter of the pipe you are using. Then refer to the attached pipe size chart. Speed Rail is a line of aluminum fittings that make it easy for anyone to build handrail or pipe-based fitting structure. Speed-Rail fittings are 100% reusable and require no welding, threading, drilling or bolting - each fitting has from one to five case-hardened set-screws depending on the number of pipes to be joined. These fittings can support an axial load of 2000 lbs per set screw with the set screw tightened to a torque of 29 lbs/ft. This is normally obtained when the screw is fully tightened using a ratchet wrench.