uxcell 10Pcs Black 16mm Dia Round Plastic Blanking End Cap Tubing Tube Insert Item Name : Round Tube Insert;Total Size : 16 x 14mm / 0.6" x 0.5" (D*H) Inner Dia : 8mm/0.3";Color : Black Material : Plastic Weight : 13g Package Content : 10 x Round Tube Inserts