Product information tags formed from plastic sheet are adapted to engage a merchandise support hook between two arms of an angle iron hook support member. In one form of the invention a mounting portion of the sheet is divided into two panels with a transverse fold line therebetween and apertures in the respective panels connected by a longitudinal slit which allows the mounting portion to be pressed down over a part of the hook within the angle-iron support and snapped into place with the respective panels juxtaposed with the limbs of the support. In a second form of the invention the mounting portion of the tag is formed of four panels which fold to provide a triangular-section wedge with similar apertures and longitudinal slit allowing the wedge to be snapped over the hook into the angle iron support.