• This listing is for Square D's version of the very popular Siemens breaker lock ECQL1 that I sell 1000's of a year. These work very well to keep a circuit break either locked on of off!! 
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•  To be clear these are for SQ D QO breakers only, if your looking for the other ones search for ECQL1 ( you'll find me) they fit most other breakers. 
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• These are New but old stock so some of the packages are a little rough/ dirty but rest assured the breaker locks are all brand new!
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• The last photo is where you can use a breaker lock to lock off a shorted line, permanently or until you can get it fixed!!