ACCO Prong Fasteners, Premium, 3" Capacity, 8.5" Centers, Complete Set, 50 per Box (70723) The original two-piece self-locking fasteners that give you secure, book-like binding to save document storage space Sturdy fasteners in specialty sizes for special and non-standard applications Heavy gauge- high-grade material for superior strength and durability; 3" capacity; 8-1/2" size prong to prong Coined edges are smooth and safe; Tin coated matte finish; Complete sets, 50 per box