Abstract: A snap hook includes a hook member having a gap formed by an attaching end and a receiving end, a pivotal gate pivotally secured to the hook member and having a notch for receiving the receiving end of the hook member, a locking member is rotatably and slidably engaged onto the pivotal gate and includes a slot for aligning with the notch of the pivotal gate for allowing the pivotal gate and the locking member to be rotated relative to the hook member from the locking position to the unlocking position, and the locking member includes a guiding channel for guiding the locking member to slide longitudinally and to rotate relative to the pivotal gate and the hook member for a limited moving distance and for a limited rotational angle.

Abstract: A snap hook includes a channel and an orifice of different height formed in an attaching end of a hook member and a latching cavity formed in a receiving end of the hook member, a pivotal gate having one end attached to the attaching end with an axle, and a latch member attached to the other end for engaging with the latching cavity of the hook member, the axle includes one or more flat surfaces for engaging into the narrower channel of the hook member and for selectively moving the latch member to engage with the latching cavity of the hook member and to lock the pivotal gate to the hook member, and for preventing the pivotal gate from being unlocked or opened inadvertently.