Centro Bulb Duster designed to provide even dispersion of smaller granules of insect bait, Niban, Baygon 2% and similar particles. This device is used to place granules inside cracks and crevices where they will do the maximum amount of good. Brass extension nozzle (shown left in photo) is not part of duster. This duster is primarily for granules and coarse dusts. Does not include extension brass tube shown.