located in the heart of silicon valley, foster brothers security systems, inc. has been satisfying the locksmith and security requirements of business and the industrial sector in the san francisco bay area for over thirty-five years. as the valley grew, foster brothers has grown to meet the needs of our hundreds of customers, providing them with security systems, locks and keys, as well as access control devices. our clients include some of the biggest companies in the nation. we have always taken pride in providing our customers with quick, professional and economical solutions.