Model M2 M2.5 M3.5 M4. M4 x 16 mm. M4 x 20 mm. M2 x 10 mm. M2.5 x 10 mm. Material Aluminium Alloy. M3.5 x 14 mm. 3、easy to install so that it sits properly between the screw head and the surface of the object being fastened, then tighten the screw to hold the washer in place.
eBay