Acco economy prong fasteners, 3-1/2″ sheet capacity, 8-1/2″l base, 50/box securely bind piles of paper with these prong fasteners. Insert flexible fastener prongs through standard two-hole punched compressor holes, flatten prongs and adjust compressor’s sliding rails to lock into position. Fasteners are easy to adjust as pages are added or removed. Complete sets include base with prongs and compressor. larger quantity quotes available. Please call 1-888-978-7759. this product arrives to most customers in 2-3 business days.