With a curved back design dating to 1943, patented jam release mechanism – the front piece slides up and locks into place allowing easy access to the business end of the stapler – solid metal construction and lead free enamel coating, the Zenith 520 is well deserving of both its classic status, and reputation for longevity. Each finished part is individually tested by hand to ensure its perfect functionality before leaving the factory, which gives the firm of Balma, Capoduri & Co. the confidence to offer a lifetime guarantee. Rare for a stapler. Takes standard 24/6 or equivalent staples, and is supplied with a pack of 1000 in plain wire; packs which are available separately.