18-8 Stainless Steel Countersunk Finishing Washers.  To be used with 82 degree countersink Flat and Oval Head screws.  They are a formed round washer, which is convex shaped. 

#8 Outside Diameter .543 - .518   Overall Height .110-.086                                                    #10 Outside Diameter .606 - .581   Overall Height .126-.103                                            #12 Outside Diameter .704 - .656   Overall Height .142-.113                                            #14 Outside Diameter .794 - .762   Overall Height .156-.1