The Makita Guide Rail Extension Clamp (1913K5-7) is for use with Makita Guide Rails including the 118" Guide Rail (194367-7), the 55" Guide Rail (194368-5), and the 39" Guide Rail (199140-0), all sold separately. It is engineered to hold Guide Rails firmly in place onto the material intending to be cut. The Parallel Guide installs quickly and easily for added user convenience. The Guide Rail Extension Clamp installs quickly and easily for added user convenience. It includes push clamps and a stopper.