Abstract: The one-piece device includes a shank having oppositely projecting pairs of laterally spaced jaws forming a keyhole slot therebetween. The lateral spacing of one pair of jaws is greater than that of the other pair. Both pairs of jaws have curved inner surfaces with outwardly diverging end portions and angularly disposed flats on their outer surfaces. The shank is provided with a pair of V-shaped grooves having converging curved sides for wedgedly receiving a segment of the fish line therein, one groove being between the jaws of one pair and the other groove being between the jaws of the other pair. The device is preferably fabricated from nylon.