The washers are bright zinc plated for increased corrosion resistance, and have been given the name 'Penny Washer' due to their similarity in size to an old penny.
Washers provide a smooth surface for the nut or bolt to bear on, making it less likely to loosen as a result of an uneven fastening surface.
The main purpose of a washer is to distribute the load under a bolt head or the nut face.
Boxed in 100
