Toolcraft External Hex Socket Sheet Metal Screw DIN 7504 4.2 X 19m...

Diameter - A measurement across a circle passing through the middle

Steel - An alloy made predominately of Iron combined with <2% carbon

hex socket - A type of screw drive consisting of a hexagonal recess driven by a hex wrench.

Screws - A simple device use for physically attaching two objects together

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