This is a set of five alumimium screws made of a 6061 alloy and anodized to a silver like colour.  
This is roughly 3x lighter than any stainless steel screws available, so for your projects those will for sure make you save some weight.  Ideal if those are to be threaded directly in a plastic part.
 
The screws also come with five (5) stainless steel nuts
Type: Socket cap head bolt
 
 
Warning*
Due to the nature of aluminium to be a softer material to some other alloys you need to ba carefull if you plan to use those with a nut, because they will be deformed more easily.