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Amazon.com: Prescott Plastics 1" Inch Round Plastic Plug Insert (50 Pack), Black End Cap for Metal Tubing, Fence, Glide Insert for Pipe Post, Chairs and Furniture : Tools & Home Improvement
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Threaded Inserts for 1 inch (OD) Round Tubing 1/4-20 Thread 8 Pack Metal Tubing Threaded Star Threaded Round Adapter Thread Inserts for Metal Super-Deals-Shop: Amazon.com: Industrial & Scientific
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