Grommet 16-10mm Double Flange Rubber Blazed Kiwi Sale! from $1.00 NZD /per Produc variants Default Title Qty. Add to Cart Couldn't load pickup availability Refresh Rubber grommet to fit a 16mm stem hole but to take a 10mm stem. These are standard rubber which is cheaper than silicone but requires a quick soak with hot water to give them more flex when inserting or removing from use.