Two variants of Group Marker Holders are available for identification of Terminal Block assemblies GMH1, GMH2, GMH3, GMH4, GMH5 and GMH8 are to be mounted in the grooves of End Clamps. CA509/G1 marking tag can be used with these marker holders or can be directly mounted on the end clamp. GMH6 and GMH7 can be mounted directly on Din Rails. A sticker/paper needs to be inserted in the slot which is covered by a transparent plastic sheet.