Uxcell 16Pcs Plastic Threaded Tube Inserts With M8 Thread, For 25Mm/0.98" OD Round Tube, Adjustable Round Black Plastic Plug Caster Insert Chair End

Flyshop Black M8 Threaded Plastic Plugs Round Tube End Caps Tubing Plugs Inserts Furniture Glider 38 mm Diameter 4 Pcs

4 PCS Hollow Threaded Tube Stainless Steel 4 Inch Capillary Tube Inner Threaded Rods Studs Round Tubing Metal Straight Pipe Fittings Replacement

Oajen Caster Socket Furniture Insert For 1/4" - 20 Thread, Use With 5/8" OD Round Tube, 4-Pack

M METERXITY 10-Pack Inserts For Round Tubes With M8 Thread, 1.26" (32Mm) OD Plastic Tube Insert For Chair/Table/Caster, Tubing End Cap Floor

Private Label 263795 Insert Threaded Round Tubing | Kitchen Restock

38mm X M10 X Round Metal Threaded Standard Inserts - Black HDPE

19mm X M6 X Round Metal Threaded Standard Inserts - Grey HDPE

M8 X 25mm Round Spring Threaded Inserts - Polished Steel

Round Tubing Inserts - RTI-3/4 14-20