Blanking End Caps 13mm Dia Plastic Round Tubing Tube Inserts 12 Pcs Item Name : Round Tube Insert;Thread Diameter(Each) : 13mm/ 0.5" Total Size : 15 x 9mm/ 0.6" x 0.4"(D*H);Color : Black Material : Plastic Weight : 8g Package Content : 12 x Round Tube Insert