uxcell Plastic Flush Type Locking Hole Cap Covers Bung Tube Insert 12mm Dia 50pcs Black Color: Black; Total Size: 15.5 x 7mm/ 0.6" x 0.3" (D*H) Material: Plastic; Net Weight: 19g Package Content: 50(+/-2%) x Tube Inserts; Product Name: Tube Insert Battery Included: No; Inner Diameter: 11mm/ 0.43" Thread Diameter(Each): 12mm/ 0.47"