Screw 13 zinc-plated TFS 4.0x25 10-pack

A screw consists of a head, shank, thread, and tip. The shape of the head determines the screw's application.

The shape is designated as follows:
TKS = wood screw, domed head.
TFS = wood screw, countersunk.
TKFS = wood screw, raised countersunk. The surface treatment can also vary.

The most common designations are:
Fn = Nickel plated
Mäss = Brass
FZB = Bright zinc plated