I placed this item near my amazon's food bowl, where he usually wipes the excess food from his beak on the perch he's standing on. Although I've never seen him use the lava stone to grind his beak down, he does use it to get the food off, which must also grind his beak. The metal screw attachment that comes on the stone is pretty small, making it difficult to grab onto the cage between the bars, but if positioned just right, it stays and has never fallen off yet in 2 weeks.