The wide/low profilehead of the screw acts as a washer and they also have a socket head for easy, no slip installation. Bright Zinc plated with clear chromate.
These also have unlimited uses in areas outside the hobby such as household, crafts, garage, vehicles, farm, agricultural, woodworking and many more.
Used with permission, copyright 2018 Tower Hobbies, Inc. Copyright 2018 Brey Corp. t/a Hobby Works.