Material: AluminumPlank Width: Up To 20"Recommended For Use With 300 lbs. Type 1A And 375 lbs. Type 1AA Extension Ladders. OSHA And ANSI Allow Use With 250 lbs. Type 1 Extension LaddersPlatform Clamp System Secures Platform To Ladder Jacks And Ties Supporting Ladders Together To Help Secure Entire Ladder Jack System2-Rung Model Mounts On Either Side Of Extension Ladder Easily And QuicklyDesigned For Quick Field Adjustments