Pro lift T-6903D is a 3-ton double locking jack stands. It features a high quality cast ductile Iron Ratchet bar and sturdy stamped steel base provide durability and longevity which makes ideal for home, professional and farm use. Always used in pairs, counter weighted pawls serve as a safe secure locking device to prevent the load from accidental disengagement. An attached pin lock provides support, locking the ratchet bar in place for an additional carrying point. One-piece, multi-position ductile ratchet bar provides strength and durability as well as a quick adjustment mechanism that securely locks into the desired position.