uxcell Plastic Household Flush Type Locking Hole Caps Covers Tube Insert 60pcs White Color: White; Total Size: 18 x 9mm/0.7" x 0.35"(Head Dia*H) Material: Plastic; Net Weight: 31g Package Content: 60(+/-2%) x Tube Inserts; Product Name: Tube Insert Battery Included: No; Inner Diameter: 13mm/0.5" Thread Diameter: 15mm/0.6"