These screws have been sorted in a plastic see through tower with carrying handle each screw can be removed individually and there is a compartment for each screw size each screw has a pz2 head when you buy this set youll have all the most common sized screws in one set total contents 400 stainless steel screws contents 120 piece 35 x 25 mm 100 piece 40 x 30 mm 100 piece 40 x 40 mm 50 piece 50 x 50 mm 30 piece 50 x 60 mm