Quick view #10, ID=0.2", OD=0.5", THK=0.04" Flat Washers, Brass Brass: machinable, ductile, corrosion resistant, excellent electrical and thermal conductivity.The nominal diameter is the bolt size to use for this flat washer.Diameter (Nominal): #10Inside Diameter (Nominal): 0.2"Outside Diameter (Nominal): 0... $41.20 Compare