Hellermanntyton fixing clip steel and pvc liner afcs series hellermann tyton 166 50603 the hellermanntyton 166 50603 is a flexible conduit fixing clip from the afcs series the fixing clip has a nominal diameter of 21mm manufactured from galvanised steel gs and includes a black pvc liner produced from polyvinylchloride pvc hellermanntyton 166 50603 afcs fixing clip steel and pvc liner afcs20 21mm