Description
A screw consists of a head, shank, thread and tip. The shape of the head determines what you can use the screw for.
The shape is designated as follows: 
TKS = wood screw, balled head. 
TFS = wood screw, countersunk. 
TKFS = wood screw, countersunk.
The surface treatment can also be different. 
The most common designations are:
Fn = Nickel-plated
Mäss = Brass
FZB = bright zinc-plated

															
															
															
															
															
															
															
															
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