Fall Protection in Construction - Supported Access - OSHAcademy free online training
MetalTech 21.75 in. x 10 in. x 29 in. Aluminum Adjustable 3-Rung Ladder Jacks for Scaffold Extension Walk Boards or Ladder, 2-Pack E-LJ30P - The Home Depot
How to Setup and Use Ladder Jack Scaffold - Sunset Ladder & Scaffold Blog
2 Rung Short Body Ladder Jacks - Badger Ladder & Scaffold