title: Master Lock - Four (4) Pro Series Hidden Shackle Padlocks, Keyed Alike 6271NKA-4 w/ BumpStop Technology
full: Master Lock - Four (4) Pro Series Hidden Shackle Padlocks, Keyed Alike -4 w/ BumpStop Technology
  [' BumpStop ', '- 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.', 'ProSeries Reinforced Zinc Die-Cast', 'Why Zinc Castings?', 'For countless decorative and functional applications no other material and process can match the properties and economics of zinc die casting.', 'Toughness:', 'Few materials provide the strength and toughness of zinc alloys. Impact resistance is significantly higher than cast aluminum alloys, plastics, and grey cast iron.', 'Strength & Ductility:', 'Zinc alloys offer high strengths (to 60,000 psi) and superior elongation for strong designs and formability for bending, crimping and riveting operations.', 'Anti-Sparking:', 'Zinc alloys are non-sparking and suitable for hazardous location applications such as coal mines, tankers and refineries']
  ['This listing is for 4 keyed alike locks - 8 keys included. The hardened diecast zinc body is strong, durable and resists corrosion. Pro Series Padlocks are designed for Commercial/Industrial applications. Ideal for transportation, vending, gates, and industrial uses.', 'These Locks  BumpStop Advanced Cylinder Technology (For explanation see more product details below).', 'HIGH  6-pin cyclinder for maximum pick resistance. Removable cylinder for replacement or repinning.', 'BOLT CUTTER TOUGH - fully shielded hardened boron alloy shackle offers impossible to cut and pry resistance features.', 'Lock dimensions (see image) - A) 3/8 (10mm), B) 19/32 (15mm), C) 1-23/32 (44mm) Width 2-7/8 (73mm)']
  {"Brand": "Master Lock", "Special Feature": "Key Lock", "Lock Type": "Key Lock", "Material": "Zinc", "Recommended Uses For Product": "Security", "Number of Pieces": "1", "Controller Type": "Hand Control", "Control Method": "App", "Manufacturer": "Master Lock", "Item Weight": "7.28 pounds", "Package Dimensions": "8.23 x 4.69 x 4.33 inches", "Country of Origin": "Mexico", "Is Discontinued By Manufacturer": "No", "Manufacturer Part Number": "-4", "Special Features": "Key Lock", "Date First Available": "March 31, 2009"}