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 Easy 3-number dialing with automatic scrambling feature to prevent reopening of lock Optional color dials, customized dials, locks sold in groups of combinations, back case printing, and Simple Combo combinations - see Catalog for details BEST USED FOR: INDOORS Cabinets School, Employee, & Health Club Self-Storage Units & Lockers For business and indoors use Product Number: 1525 Description: Control Key, Commercial Boxed Packaging Master Carton Qty: 25 Body Width: 1-7/8in (48mm) Shackle Length: 3/4in (19mm) Shackle Width: 13/16in (21mm) Shackle Diameter: 9/32in (7mm) Color: Black 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. Override key can be purchased separately