Sidelock file fasteners are simple to use, just slip your punched documents onto the prongs, pop compressor bar over the top and fold. | Prong stay folded in place for reliable, semi permanent binding | Locking feature that secures your documents better than normal ringlock fasteners | Will bind documents up to 50 mm thick | Base: 80 mm L x 13 mm W | Prongs: 57 mm | Fastener: 93 mm L x 12 mm W