If you need to make regular cove cuts or fancy cove edges, the WSB classical cove carbide-tipped router bit is the bit for the job. It will be a staple in your list of routing tools. The bit size is 1/2" X 5/8" (see picture diagram for detailed measurements).
WSB router bits are manufactured to high quality standards and come with a 100% satisfaction guarantee. If you aren't satisfied, return them.