Contact Us For Commercial Security

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Contact Information

Commercial Sales: (302) 244-5427

Security Instrument is the largest privately owned commercial security company in Delaware. We design, install and support integrated systems for SMB’s and enterprises throughout Delaware, Pennsylvania, New Jersey and Maryland.


Wilmington, DE Office
309 West Newport Pike
Wilmington, DE 19804

Milton, DE Office

28340 Lewes Georgetown Hwy.
Milton, DE 19968