Their large diameter makes them suitable
to use over slots.
See also: DIN 6319-NI metric size stainless steel two-piece spherical washers TPSWS inch size steel or stainless steel two-piece spherical washers DIN 6319 C and DIN 6319 D steel spherical and dished washers GN 350.3 / GN 350.3-NI steel and stainless steel spherical leveling washers
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