what do you call these washers

[purdum]

I would like to find some more of these washers but don't know what to search for

thats a 10mm wrench to give perspective
Thanks
Greg

 

[kd4gij]

Thay are called shoulder washer.

 

[purdum]

Perfect Thanks kd

 

[Steevo]

Sometimes also known as:
Flanged bushing
Machine bushing
Sleeve Washer

 

[big.jim]

top hat washer too