Torsion Key Unloading Tool for 4.25" Wide Member.Made of iron.Designed for use with front torsion bar suspension systems on vehicles requiring a 4.25 inch wide torsion bar member.Compatible with , GM HD, and Explorer models equipped with front torsion key suspension.May require notching of the torsion bar member for proper fitment.Features a squared design to minimize rocking or slipping during use.Installation involves inserting the tool into the torsion bar and turning clockwise or counterclockwise to safely release tension.Multipurpose grease is required for lubrication of the center bolt before each use; grease is not included.