Description:-Easy to use: The black plug hole cover are very easy to install and don't require any professional knowledge and skills. Just gently insert it into the desired hole or pipe by hand.-High Stability: While the black silicone plug hole are very easy to install, they can also be adjusted with tools to ensure a tighter fit, increasing their firmness and durability.-Notes:All dimensions are measured manually and there may be small deviations.Feature:Material: Silicone rubberOuter Diameter: 23mm/0.9"Inner Diameter: 15mm/0.59"Height: 14mm/0.55"Temperature Resistant from -40℃ to 250℃Package Content:10 x Rubber Hole Plugs