Aluminum grommets for rubber tubing. These are used so you can run one piece of tubing from the water pickup to the motor or esc in your boat. These are simple to install, drill a hole and use silicon or epoxy to hold it in. We suggest a body reamer to make the hole. These are available in 6 sizes, depending on the outer diameter of your tubing.- For 4.00mm OD tubing - For 4.60mm OD tubing - For 6.00mm OD tubing - For 6.35mm OD tubing : PN# ose-tubing-1/4-clear- For 6.80mm OD tubing : PN# ose-tubing-9/32-clear- For 6.80mm OD tubing : PN# tfl-213b25 9/32 blue tubing- For 7.90mm OD tubing : PN# mo-clr-tub tubing Installation note: First cut a 45-degree angle on the tubing. Then apply a thin coating of oil on the outside of the tubing. Start the tubing into the hole, then pull the tubing through the grommet from the opposite side with a pair of pliers. Includes: (2) Per pack Material: Anodized aluminumNote: The picture of the boat with grommets is for display only. This item only contains (2) grommets.