These risers are for use with q connect executive letter trays professional quality trays for a4 and foolscap files clip them into place stack two or more executive trays together and expand the space for filing incoming and outgoing papers providing extra capacity these letter tray risers are ideal for handling large volumes of documents this pack contains 4 black risers clip on letter tray risers suitable for q connect executive letter trays create more space by stacking trays create