To lock:  close the gate; the built-in spring locks the gate against the hook tip.

To unlock: lift the gate upward on the hook shank and swing open.

To lock:  close the gate; a stainless steel pin is mounted in a horizontal bore which passes through the gate and engages a notch milled in the hook shank.

To unlock:   move the lever downward a quarter-turn or until it stops, the gate can now swing open 160° (approx.)

To lock:  close the gate; a stainless steel pin is carried in a horizontal bore and engages a milled slot in the hook shank.

To unlock:  simply depress the stainless steel pin which causes the pin to disengage from the milled slot.

To lock:  press the arm down until the lock trips; two arms of the gate now enclose the tip of the hook.

To unlock:  manually depressing the locking trigger automatically raises the  movable arm, allowing the gate to be rotated open.