JSP Manufacturing 3" Round Plastic Louver Vent This is a multi-color/quantity item. Please select correct color and quantity needed. This 3" Round Plastic Louver is heavy duty, injection molded plastic for strength. Fit into 3 inch round holes using drill type hole saw and held in place by the knobs on sides of vent. These ventilating soffits are universal and can be used for eaves, reptile cages, display cases, spice racks, and any other place where you need air ventilation. 3" Round Polypropylene Plastic Louver Heavy Duty, injection molded, plastic Multi-purpose - for eaves, reptile cages, display cases, and spice racks Perfect for ventilating soffits Ideal for room exhaust and intake ventilation use Easy Installation into wood - may not work with metal glass or PVC pipe Held in place by knobs on the side of vent Recommend using drill type hole saw Exact item is pictured Pack Sizes Available: 1, 2, 4, 8, 12, and 16 pack Color: Black, Brown, Grey or White Made in USA Brand: JSP Manufacturing MPN: HI-VENT-3inch Measures Approximately: Outside Length: 3-5/8 inches Inside Width: 3 inches Overall Height: 3/4 inches Fits: 3 inch round holes