The S4 Adjustable Joist Bracket fits both an S4x7.7 or S4x9.5 I-Beam. When joists run perpendicular to the wall being repaired, the 20 inch adjustable joist bracket will transfer the load at the top of the wall brace to the floor joists. Engineer approved and recommended Product. Over time the bracket can be adjusted to straighten the wall and maintain proper tension. Adjustments can be made by the property owner and requires no special training to complete.