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The Master Lock No. 2001 high security combination padlock provides three times the security of competitive products. Enhanced security features such as a dual ball bearing, deadbolt locking mechanism, hardened, boron alloy shackle and a reinforced stainless steel outer case provide protection against attacks. Designed to fit lockers with a padlock eye of at least 11/32in (9mm) diameter, these locks provide thousands of possible combinations.