Hana ʻia ʻo Tianjin Wangxia Garage Door Torsion Springs mai ke kiʻekiʻe-tensile, ka aila-tempered spring wire, e hui ana me ASTM A229, ʻOiai ua hoʻomehana ʻia nā pūnāwai torsion oil-tempered i ka aila.
Ma keʻano he mea kūʻai mai Garage Door Spring, loaʻa iā mākou nāʻano nui likeʻole o Garage Door Torsion Springs i loaʻa no ke kūʻaiʻana e kūpono i nāʻano hale noho a me nā puka hale kaʻa.