This hand-held, bellows-type duster is perfect for applying your Diatomaceous Earth into large voids or small cracks and crevices. It can also be used wherever you need to apply DE (on pets, in bedding, etc) as it allows the powder to be evenly disbursed in puffs you control with your hand pressure on the device. Simple to use and durable (will not rust). Use it in your home or outside.