Abstract: A double action closure mechanism operable with the thumb and forefinger of one hand, comprises a rigid body, such as a forged hook, having a first end, a second end forming a curved nose, and a shank extending between the ends, the shank defining a front side facing the nose, and a back side facing away from the nose. A closure frame is pivotally connected to the front side of the shank and defines a locking corner at the back side of the shank, a latching corner adjacent the nose of the rigid body, and an actuating corner at the front side of the shank, adjacent the pivotal connection. The latching corner includes a latching surface adapted to close against the nose when the frame is pivoted about the shank into a closed position, and to move away from the nose toward the shank when the frame is pivoted about the shank into an open position. A spring is connected between the front side of the shank and the frame, for urging the frame into a normally closed position.