The Insight Cuttlebone holder is the first of its kind. No more difficult wires, this plastic easy bolt on holder can be used on vertical or horizontal barred cages. This holder even has a moveable perch that moves up or down for comfortable access to the cuttlebone as it is eaten. Easy to use and dishwasher safe. Features: Designed for a bird's well being Holds all cuttlebones Helps keep cuttlebone debris and fragments from falling outside the cage Suitable for parakeets, canaries, cockatiels and finches Made of durable that's easy to clean Easily attaches to your bird's cage Directions: Screw InSight Cuttlebone Holder onto cage wall. Unlatch and swing open the Support. Place any cuttlebone into the holder and close the support.