Revolutionary SureHook™ features built-in tension springs. Stronger, sturdier rods and hooks bend less, and the folders slide with ease. Full-height gussets will not catch on drawer rails. 3 1/2" expansion. Polylaminate reinforced top and bottom edges provide superior durability. Folder Size Type: Letter; Max Folder Expansion: 3.5"; Folder Color: Standard Green; Color Family: Green.