What materials are used to make the BenjiLock? BenjiLock Care Team December 21, 2018 00:34 Updated Follow The BenjiLock is constructed with a hardened steel shackle and has a diecast zinc alloy body for maximum security. Related articles BenjiLock Shackle How many keys does the BenjiLock come with? Can someone familiar with BenjiLock add their own fingerprint to my lock? ASTM Standards What is a "Master User"?