Blue Conical washers (4) for M3 or 4-40 Cap head screws.
Use on 3mm or 4-40 cap head screws.
The flange distributes the load over a greater area and enabling a more secure install.
Dress up most any cap head screw.
Outside diameter: 8.2mm
Inside diameter:5.5 mm
description revised by: WP February 4, 2014