The Master Lock No. 2076 SmoothSpin™ portable combination padlock with key control for supervisory access are an ADA Inspired padlock due to the easy operation and large numbers and increments for easy combination find. Including enhanced security features such as BlockGuard® Anti-Shim Technology and a hardened steel shackle, these padlocks can withstand prying and cutting attacks. Designed to fit lockers with a padlock eye of at least 5/16in (8mm) diameter.