The Book End Support clips neatly onto any shelf up to 25mm thick. Indexing is made easier by the use of optional flat or triangular clear plastic label holders (label holders and labels not included, sold separately). Together, they make a distinctive section divider, label holder or index block. • Polystyrene construction • 3 simple steps: choose a colour, select a label holder and add the flat or angled cards (cards sold by pack of 100) • Main image shows three components which are all available separately