The length of wire I use is different for different size baits, for example, on a normal size 1/4oz spinnerbait I cut a rough length of 5" off of a coil of wire, for 3/8oz I cut 5.75" off and for a 1/2oz I'll cut a rough length of 6.5". I buy wire in coils, it springs off pretty good and toward the end of a coil you will have to do minimal straightening but nothing too bad. If you buy pre-made wire forms, they will sometimes give you dimensions like a hook leg and a blade leg or arm, this is where it gets tricky, some will give you a hook leg length of like 1.5" or so, that is the amount of wire that sticks out the end of the bait and it varies based on the size. There are times you'll get the entire dimension which is also kind of wrong as the don't take the hook bend or the "R" bend into account. The amount of wire coming out of the head will vary but you can adjust it, I tend to use a smaller length coming out of the head when using small diameter wire but there is a point where the bait will get off balance to the point it will lay over on its side when you reel at all but the slowest of speeds .