We tested the HARRIS Diatomaceous Earth Powder Duster with Extension Nozzle on a variety of surfaces, from the gaps behind kitchen cabinets to the outdoor siding where yellowjackets were attempting to nest. The Harris Powder Duster is easily loadable and a great way to efficiently spread a light dusting of fine powder applications. Can be used indoors or outdoors. Efficient Distribution: Powder duster distributes dusts and powders evenly and efficiently. Indoor Use: Use indoors to treat cracks, crevices, and other hard-to-reach places. Use the Harris powder duster for application of diatomaceous earth, boric acid and more. With an extension nozzle of 6 inches, the duster is perfect for reaching tough areas with a light coating of powder. Once filled, screw the cap on tight and turn the duster upside down. Natural diatomaceous earth product composed of 100% freshwater DE with no additives or fillers and included powder duster for easy application (4 lbs). High-output professional sprayer delivers over 3 mL per pull and sprays up to 30 feet with adjustable nozzle. Fine Tip Nozzle - 6 extension included for precise application,li Light Dusting - Spreads diatomaceous earth evenly and efficiently, Use in Multiple Settings - Perfect for household use in residences and apartments or outdoors on plants and garden, Great for Tight Spaces - Places powder in difficult to reach areas, saving you time and effort, The Harris Powder Duster is easily loadable and a great way to efficiently spread a light dusting of fine powder applications. Can be used indoors or outdoors. This Harris Food Grade Diatomaceous Earth with Included Powder Duster is composed of 100% ground freshwater diatomaceous earth, with no additives. The product is made of the naturally occurring fossilized remains of diatoms, a type of algae that forms in freshwater. The Diatomaceous Earth Powder Duster Applicator spreads powders and dusts evenly and efficiently. It is easily loadable and perfect for residential and commercial use. Product Details About This Product Harris Ground Fresh 100% Diatomaceous Earth is OMRI listed with the Organic Materials Review Institute and meets organic use standards. A GRAS item (generally recognized as safe by the FDA). Can be used in animal feed. Professional Powder Duster included for easy application.