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 ASTM Standards How many keys does the BenjiLock come with? What is a "Master User"? Can someone familiar with BenjiLock add their own fingerprint to my lock?