At the moment, there are over one thousand different sizes of rubber grommets. There are also many different shapes and styles, which also affects the size of the rubber grommet itself. The rubber grommets that are for decorative purposes are usually fairly small, as they are usually used on shoes for lace holes for the most part. When it comes to rubber grommets for farm equipment these are a lot larger, usually the largest sizes that you can purchase. The rubber grommets that are used for gardening will vary in size, they are usually somewhere in between the largest and the smallest.
If you are looking at rubber grommet sizes for electrical equipment such as cables, then you should look at a chart if you can. One example is a rubber grommet made from Styrene Butadiene. This is a form of rubber that is fairly strong. This is specifically for electrical cables and can usually be found with an outside diameter of two and three quarter inches. You would usually find this style and size of rubber grommets on a desk in an office. The price of this kind of rubber grommet is usually fairly cheap, you can usually expect to pay around five dollars for one.
Another example of a rubber grommet is that is used with electrical cables is one that is made out of Neoprene. This, again, is another form of good rubber. The purpose of this rubber grommet is to protect the cables from damage when they are passed through another material. Often the material that it is passing through will have sharp edges which could easily damage wires or cables. The size that you would usually find this kind of rubber grommet in is half an inch, so it is one of the smaller rubber grommets.
Larger rubber grommets are made from a variety of different rubber materials. There are many different styles, shapes and sizes. The biggest rubber grommets are usually used for farming and drainage equipment. If you are looking for smaller grommets such as the ones mentioned above then you can try your local DIY store, as they will usually stock this kind of thing. For the larger rubber grommets, you can try specialist shops as they are more likely to sell them. Alternatively, you can take a look on the internet as there are more options for you to choose from.