Firehole Sticks 633 Hooks, The 633 is a 1X length nymph hook perfect for bead head patterns. It is a great choice for anything with a bead. This is a 1X long length hook with a 2X gape. It has a down eye and is formed from a heavy weight wire. made from high strength carbon steel, which is properly hardened and tempered. The 633 hook is chemically sharpened and finished with a black nickel coating.