Wieland fasis greyblue partitions twfn for wfkn 2541016 terminal blocks wieland 0731297550 this grey terminal block partition twfn 4 e from wieland is for use with the range of fasis wkfn 4 e din rail feed through terminal blocks and can easily be attached via the snap in feature the thickness of the partition is 15mm wieland 0731297550 partition for wkfn blocks twfn 435 e grey