This clip-on sign holder is sold as a set of 100 units. The clear acrylic display is made up of two hinged clasps, one of which holds signage while the other attaches to an edge of a basket, bin or shelf. The clip-on sign holder is capable of displaying poster board up to 0.25-Inch thick. The 3-Inch wide grip keeps signage vertical; however we recommend using materials thicker than regular paper for best results. This clip-on sign holder uses a clasp at the bottom to attach to an edge that is less than 1-Inch thick. In-between the two grippers is a plastic ball joint that allows a user to rotate and tilt his or her signage 360 degrees around.