Kwikset privacy key is 2-1/2 inches long with a flat on one end and a grip hold on the other. Instructions for use, place the flat slotted end of the key into the center of the knob/ lever hole. Insert the key until it stops. Turn the key clockwise until the key falls into the groove. Turn the key to the left on lever locks and to the right on knob locks to open. Schlage privacy key is 2-1/8 inches long with a round shaft with a flat on one end and a loop on the other. Instructions for use, Fully insert the end of the key into the center of the hole and push to unlock.