A locking member to be used in conjunction with a guide ring and a lift cord configured to raise of lower a covering for an architectural opening, such as a window, door or the like, is disclosed. The locking member is configured to engage the guide ring and the lift cord in such a way that the locking member has a selective rotative ability, which allows the lift cord to freely move in a first direction to raise or lower the covering, but the locking member will move or rotate about the guide ring when the lift cord is pulled in a second direction to pinch the lift cord between the locking member and the guide ring so that the lift cord is prevented from being pulled away from the covering far enough to create a loop of a certain diameter.