Estimators say spec book. Architects say Project Manual. Both mean the same written half of the bid packet.
The book opens with the front end documents. Division 01 follows with rules for the whole job. The technical divisions follow that.
A toilet accessory supplier may need only a few pages of it. But the front end still sets the bid date, the bonds and the tax status.
Search the book for your product names as well as your section number. Your items can appear in sections you did not expect.