The C shaped profile is based on the V-Slot linear guide system. This profile gives added strength and functionality. It is considered to be a 40mmx80mm profile and all our standard V-Slot parts and accessories are compatible. Made from 6063 T-5 Aluminium the profile has an extremely smooth linear v groove rail on all 4 sides. It is precise, easy to work with and can be incorporated into many different designs and builds.