Apple's line of PowerBook laptops was intended for the professional and power users. The PowerBook line includes the PowerBook 100, Duo, 500, and 5300 Series; the PowerBook 1400, 2400, 3400; the PowerBook G3, G4 Titanium, and G4 Aluminum.
For the exact screw set, we would need to know the exact PowerBook. In the search box with the magnifying glass, just type in "screw" and it will list the different sets available. i.e. G4 Titanium Mercury Screw Set