It’s likely that your current garage floor drain cover is made of cast iron or plastic. Both of these materials are cheap and allow for mass production, so they are a popular choice for parts like these.
Consider all of the exposure your garage floor gets. Your car treks in dirt, snow, and dust on a regular basis. When you open your garage, the floor is exposed to the outside elements. So, depending on the season, your garage floor can get some serious heat or cold exposure. If you have a cheap garage floor drain cover, it’s not going to hold up against the elements.
Although cast iron is cheap, it’s a thin and brittle material. Cast iron is also not resistant to weather changes and heavy traffic, which means that your cast iron floor drain cover is going to rust, chip, and potentially break into smaller pieces. If your drain cover does break, those pieces will fall into the drain itself, which can create a host of problems. If you opt for a stronger replacement drain cover, you’ll avoid these issues and you’ll have a long term solution that lasts.