uxcell Round Plastic Blanking End Cap Tubing Tube Insert 30mm Diameter 12 Pcs Item Name : Round Tube Insert;Thread Diameter : 28mm/ 1.1" Total Size : 30 x 17mm/ 1.2" x 0.67"(D*H);Color : Black Material : Plastic Weight : 56g Package Content : 12 x Round Tube Insert