P.S. – They also make a 3 inch version which uses slightly smaller blades. If you watch the video above you will see just how compact the 3.5 is, so I don’t know that anyone really needs a smaller frame but it does exist. For me owning two other products in the line I didn’t want to add a third required blade length though. So I did not even consider it. Finally those 5 inch blades for the Fin/Bone will lock right into this knife as well, so you can keep them with your fishing gear, carry the 3.5 as an EDC tool, and convert it to a fillet knife on your fishing trips.