Add organization to any top tab or end tab folder. When used in standard fastener folders, these dividers classify papers in up to four categories. To create additional filing surfaces, add self-adhesive or twin prong fasteners to your dividers. Add subdivision to any file. Simply peel off protective strip and press into any top tab or end tab folder. Twin-Prong Fasteners. Folder Size: Letter; Total Number of Dividers: 0; Total Number of Fasteners: 1; Color Family: Manila.