The E-Series Line of MUL-T-LOCK Padlocks is designed to offer the Highest Level of Padlock Protection available in the market today. All E-Series Padlocks are made of Boron Alloy and can uphold to the most determined attempts of physical abuse. They are available with or without a Shackle Guard for extra protection. E-Series Padlocks are also available in Sliding Bolt Configuration (SBE) for superior shackle protection. When looking for the Ultimate in High-Security Padlock Protection the MUL-T-LOCK'S E-Series line of padlocks is your answer.