Hi George
I checked your order and can see you ordered 50x 1/4" x 1/2 washers, as per the technical spec table on our website, they have an internal measurement (ID) between 7.10 - 7.37mm to allow it to fix over a 1/4" fastener.
Our M6 washers have a internal measurement between 6.10 - 6.70mm.
Would you like us to send you 50 of the M6 at no charge
Regards
Michael