Steel shackle hardened to HRC 40 degrees. Resists sawing cutting and prying. Solid brass cylinder 4 pin tumbler for smooth operation. Complete with 3 piece key. Standard key blanks are easily duplicated. ⚠ WARNING: This product can expose you to LEAD, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.