The POWERTEC Rectangular Dust Hood is the perfect solution when a smaller rectangular dust hood is needed for your dust collection system.Easy to install and high performing, this handy accessory will optimize the suckage of dust, debris and chips out of your shop and into your dust-collector. Pre-drilled mounting holes make for easy and secure installation. Create a cleaner, healthier shop environment with this essential component. Hood measures 4-1/4-Inch x 7-Inch. 4-Inch nominal end measures 3-31/32-Inch O.D. and 3-39/64-Inch I.D.