Master Lock: Tough Under Fire! Master Lock?s new patent-pending BumpStop™ Cylinder Technology prevents the transfer of force from bump key to pins and blocks rotation of cylinders! BumpStop? is 4 times stronger than the toughest proposed anti-bump industry standard. Rely on Master Lock Company to continue to respond to the market?s latest security requirements with expert, innovative solutions. Master Lock offers residential, automotive, commercial and locker lock products. Master Lock carries multiple product lines including; Master Lock ATV Winches, Master Lock Cycle, Master Lock Door Hardware, Master Lock TSA, Locker Manager, Safety Series and Master Lock Bike. Master Lock products include locks, padlocks, cycle locks, combination locks, keyed locks, locker locks, home security locks and other security products.
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