uxcell 20pcs Black Plastic 28mm Diameter Round Tubing Tube Insert Cap Bung Item Name : Round Tube Insert;Thread Diameter(Each) : 27mm/1.06" Total Size : 28 x 15mm/1.1" x 0.6"(D*H);Color : Black Material : Plastic Weight : 68g Package Content : 20 x Round Tube Insert