Wieland fasis greyblue partitions twfn for wfkn 2541016 terminal blocks wieland 0731293550 this grey terminal block partition twfn 435 from wieland is for use with the fasis wkfn 435 din rail feed through terminal block and can easily be attached via the snap in feature the thickness of the partition is 15mm wieland 0731293550 partition for wkfn blocks twfn 435 grey