Brass washers are great to incorporate into your mixed media designs.
The rivets CCBR1011and CCBR1013 will fit this washer. You can use this for extra holding when you mushroom out the shank of the rivet
Washer is 5/16" (8.0mm) in diameter with a 9/64" (3.7mm) hole. It is 0.85mm (20ga) thick.