If the hole in your creation is not perfect or you simply need a replacement grommet for your standard sized stem| this 10 pack will last you through the zombie apocalypse! These standard rubber grommets are stiffer making them more forgiving than their silicone cousins. They can sometimes fix leaking issues especially where the hole is not a perfect flat circle.

Product Specifications:

• Designed to fit a 13mm hole to support a standard 10mm diameter STANDARD stem.
• Includes 6 Grommets in Pack