The Music Masters Discount Electronics MORE! You are looking at... Item: 6X (THREE Pair) Large Speaker Port Tubes 4in Wide x 4.5in Deep Woofer Subwoofer Sub Box Bass Cabinet Vent VWLTW Condition: New (Note: This is a Vital Wave product and is bulk shipped without retail packaging. This helps the environment and lowers the cost for everyone.) Description: Set of 6 Port Tube Vents 4 inches Wide x 4.5 inches Deep Enhances Response in Bass Reflex Custom Enclosures Built-In Rear Waffle Grill Provides a Professional Look Strong Molded ABS Plastic Design Great for DIY Cabinets Friction Fit or can be Glued Overall Diameter: 4 3/4 inches Fits in 4 inch Cutout 4 1/2 inches Deep Color: Black Comments: This is a set of SIX (6) classic ABS plastic port tube vents for speaker cabinets. They have a built-in mesh waffle grill that can be cut out if necessary. They provide the required venting needed for many car and home woofer boxes. Note: The mesh grill is not perfectly smooth finished and may require filing when viewed for some applications. These are for pro installers and is not a big deal but worth mentioning for accuracy and perfectionists like us. By cutting out the grill they also make a nice professional finished hole for various projects that may require wires, etc. to pass through. Overall they're an inexpensive accessory that works well. If you're not happy returns are free so you have nothing to lose. We stock a variety of speaker grills, speaker wire, cables, cords, adapters, and hard-to-find electronic accessories. Look in our store to see a great selection! Note: Please check the measurements to be sure these will work for you before you purchase. Thank you! Thanks for checking out one of our items! Please take the time to look at everything we have up for sale and check back often. You never know what you will find. We have been in business for over 30 years! We can best be described as an "old school" stereo shop and electronics store with a modern twist. We always guarantee your satisfaction and promptly take care of our customers. Shipping Handling for this item is FREE everywhere in the United States. For international shipping not listed contact us for approval and a shipping quote before making your purchase. Thanks again for looking and as always your business is appreciated!