The product is a collection of Sargent & Greenleaf Technical Bulletins from 1984 to 1990, specifically focused on locksmith equipment. These bulletins likely contain valuable information and guidance on technical aspects of locks, access control systems, and facility maintenance related to the brand's products. This resource would be particularly useful for locksmiths and professionals in the security industry looking to enhance their knowledge and skills in the areas covered by Sargent & Greenleaf during this time period.