Master Lock - Four (4) High Security Pro Series Padlocks 6127NKALH-4 w/BumpStop Technology

• If you order two 4-packs or any multiple of this lock we will automatically key them all the same.
• These locks feature the BumpStop Advanced Cylinder Technology. (for explanation see more product details below).
• DIMENSIONS: features a 2-5/8in (67mm) wide heavy steel body to withstand physical attack and a 1-7/8in (48mm) tall, 7/16in (11mm) diameter hardened boron alloy shackle for superior cut resistance.
• International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

FEATURING BumpStop TECHNOLOGY - Lock bumping a surprisingly simple method of breaking in through locked doors and padlocks - is undoubtedly the newest emerging threat to personal property security. And virtually all locks in use today are particularly vulnerable to bumping. Until now. BumpStop Advanced Cylinder Technology employs an innovative, patent pending design which utilizes a unique reverse rake tapered driver pin, high performance springs and tightly machined cylinder chambers. During a bump attempt, this design prevents the transfer of force from the bump key to the pins and therefore blocks rotation of the cylinder so that the lock remains locked.