The c-washers (slotted washers) are manufactured according to DIN 6372. For better handling, the c-washers have a knurling all around.
This article 22290.0008 - C-Washer DIN 6372 / (Nominal size: 8 mm) is one variant of the article group C-Washers DIN 6372 (EH 22290.)
Compliant according to Directive 2011/65/EU and Directive 2015/863
No SVHC substances with more than 0.1% w/w contained - SVHC list [REACH] as of 17.01.2022
No Proposition 65 substances included
https://www.P65Warnings.ca.gov/
This product does not contain any substances designated as "conflict minerals" such as tantalum, tin, gold or tungsten from the Democratic Republic of Congo or adjacent countries.