An improved asymmetric wire-hook for a closure one-piece latch wire retainer pivotally mounted to a hinged member wherein the hook is latched upon rotation through an elongated slot of an anchor member. The retainer includes axially aligned wire-lengths terminating in spaced apart opposed bend portions interconnected by the wire-hook. The wire-hook includes one end of a long finger connected to one bend portion and sloped downwardly at a predetermined obtuse-angle relative to one wire length and a short finger connected to the other bend portion and extending downwardly at a right angle relative to the remaining wire length. The long finger lower end terminates in a first acute-angled bend juncture connected to a proximate end of a single lead-in wire segment upwardly sloped at a relatively steep incline while the short finger lower end terminates in a second acute-angle bend juncture connected to a proximate end of a single lead-out wire segment upwardly sloped at a relatively flat incline. The single lead-in and lead-out segments minimizing frictional drag thereby reducing operator effort during closure latching and unlatching with the anchor member slot while the lead-out segment obviates hang-up with a downturned lip defining the slot upper edge.