This nickel plated hook for serger thread tails is 2 and 1/2 inches long. Hookey makes it quick and easy to lock serger seams. Package includes 2 Hook keys. Snip thread seam tails at 2-1/2 inches. Slip Hookey blade into serger seam one half inch or more from seam end. Hook thread tails near the ends. Pull thread tails into the seam with hook slightly rotated toward fabric. Unhook secured thread tails and clip.