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The Threat of Easy, Undetectable Lock Bumping Stops Here. Welcome to your source for unsurpassed protection against lock bumping. With BumpStop® technology, the Master Lock and American Lock security hardware found here has been proven so advaced that it greatly exceeds recently-established ASTM Grade 6 requirments for bump resistance. Safer, by Design.

The Threat of Easy, Undetectable Lock Bumping Stops Here.

Welcome to your source for unsurpassed protection against lock bumping. With BumpStop® technology, the Master Lock and American Lock security hardware found here has been proven so advaced that it greatly exceeds recently-established ASTM Grade 6 requirments for bump resistance.

Safer, by Design.