Amazon.com: Prescott Plastics 1.25" Inch Square Plastic Plug Insert (4 Pack), Black End Cap for Metal Tubing, Fence, Glide Insert for Pipe Post, Chairs and Furnitures : Industrial & Scientific
Amazon.com: Eoiips 3/16" OD 304 Stainless Steel Tube, Thickened 304 Stainless Steel Seamless Tubing Round Metal Pipe, 7.87" Length Industrial Metal Straight Tube, 6 Pcs : Industrial & Scientific