The Lower Floor Bracket fits a S4x7.7 or S4x9.5 or W4x13 I-Beam. Lower Floor Bracket to hold I-Beam or C-Channel wall bracing in place. Often used with our Stationary or Adjustable Joist Brackets. Specs: 2 x 3 Angle 4 inches Wide with (2) 5/8 inch Holes punched on 3 inch leg. Coated with a High Performance Rust Preventive Semi-Gloss Black Paint.