Many times a tablet or pill is too large for a pet to swallow. In addition, a pill can be crushed to hide in the animals food or in a treat. This pill crusher works by dropping the pill into the clear chamber and screwing the top portion directly into it. It also has a handy storage area in the lid to keep extra tablets close by. Top and bottom have raised knurled ridges for easy tightening. Made of high impact plastic. Packaged in blister pack display.