461S1000 M10 Spring Washer Stainless Steel JIS
Made in Japan.
d=ID 10.2mm +0.5
D=OD 18.4mm -0.5
Thickness 2.2mm
Max Thickness 5.2mm 
Kawasaki part number is for reference only, 
this is a Genuine JIS washer from our supplier in Japan.
Ideal replacement to the original
Equivalent to Kawasaki Part 461S1000