The price per meter (free hook processing) requires several pieces of several meters to beat several pieces 2.5 meters single open (applicable to 1 ≤ rail length ≤ 1.25 meters) height 2.7 meters can be changed 7 meters folio (applicable to 3 ≤ rail length ≤ 3.5 meters) height 2.7 meters can be changed 5 meters folio (applicable to 2 ≤ rail length ≤ 2.5 meters) height 2.7 meters can be changed 3 meters single opening (applicable to 1.25 ≤ rail length ≤ 1.5 meters) height 2.7 meters can be changed 4 meters single opening (applicable to 1.75 ≤ rail length ≤ 2 meters) height 2.7 meters can be changed 8 meters folio (applicable 3.5 ≤ rail length ≤ 4 meters) Height 2.7 meters can be changed 6 meters folio (applicable to 2.5 ≤ rail length ≤3 meters) height 2.7 meters can be changed 4 meters folio (applicable to 1.75 ≤ track length ≤2 meters) height 2.7 meters can be changed 3.5 meters single opening (applicable to 1.5 ≤ track length ≤ 1.75 meters) height 2.7 meters can be changed 2 meters single opening (applicable rail length ≤1 meters) height 2.7 meters can be changed