Patented BlockGuard anti-shim technology withstands attempts to violate the latch mechanism Includes combination chart to facilitate lock system administration Key control feature provides supervisory access; specify key to match existing system or factory assigned 1-7/8in (48mm) wide double-reinforced stainless steel body withstands abuse 3/4in (19mm) tall, hardened steel shackle for extra cut resistance The Master Lock no. 1525 3-Digit combination padlock includes key control feature for supervisory access along with many enhanced security features like the exclusive BlockGuard anti-shim technology, hardened steel shackles and double-reinforced stainless steel casing. Designed to fit lockers with a padlock eye of at least 5/16in (8mm) diameter, these locks provide multiple customization options to fit your needs.