They come in a non-catalog 3-1/4" version, and catalog versions of 4", 4.5", and 5" lengths. I've owned all, and found the 4.5" version the easiest to carry. Almost all of RMK's handle materials are available for this model, with other options such as handle shape, lanyard, etc. available as well. Your needs will likely drive your choices, but the RMK catalog is always a good place to start. A free catalog can be requested at http://www.randallknives.com
Good luck, hope that helps,
Always looking for older Randall Made Knives...