The S4 Adjustable Joist Bracket C-Channel will hold a S4x7.7 or S4x9.5 I-Beam.
The W4 Adjustable Joist Bracket C-Channel will hold a W4x13 I-Beam.
Images can be found below in Spec. Section depicting the difference as well.
Both the Adjustable and Stationary Perpendicular Brackets have oval punches. We do this because not all Joists are dead on 16 inch centers. With the Oval this allows some margin for the Lag Bolts to hit dead center. Especially on older homes the joists can fluctuate.
Perpendicular floor joist run to the wall. While Parallel floor joist run with the wall.
The 46mm Crows Foot Wrench Adapter fits on a 1/2 inch drive Torque Ratchet. Which allows the installer to place this adapter on the Adjustable Bracket 1-1/4 " Nut to see the torqued pounds if needed.