Improved design over conventional spreader bars. Carriage on main support beam moved by turning lead screw; this permits fine adjustment of the tilt angle of component being lifted. Turn lead screw manually or with air-powered tools. Spreader bar adjustment secured with locking bolts. Maximum lifting capacity: 6,000 lbs. Distance between hooks minimum: 30"; maximum: 46"; chain grade: 80. Made in the U.S.A. and covered by the Lifetime Marathon Warranty.