Master Lock Pro Series Hidden Shackle Padlocks, Keyed Alike 6271NKA-6 w/BumpStop Technology by Master Lock at eHow Blog. MPN: 6271NKAparent. Hurry! Limited time offer. Offer valid only while supplies last. 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
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