Keep your drinks safe from spiking with Beaumont's anti-spiking bottle stoppers. These plastic stoppers fit snugly inside the neck of most beer and spirit bottles. They feature a small, 6mm straw hole so you can enjoy your drink without removing the stopper. Simply screw the lid back on with the stopper in place for added security. For added convenience, Beaumont's anti-spiking stoppers also help prevent evaporation and keep bar flies out of your bottle.