Engineers Black Book (Inch)
234 pages of "must have"engineering data in a rugged binder
Fastener Black Book (Inch)
196 pages of all you need to know about fasteners in a heavy-duty binder. Also, comes with a FREE Thread gage
Electrical Black Book (USA version)
252 pages of Codes, Formulae, Circuits, Transformers, Motors, Lighting, Tools and much more in a durable binder