Tandy Leather 3/16" Nickel Plate Eyelets 1286-12
You are looking at one brand new one hundred pack package of Tandy Leathercraft 3/16" (4.8 mm) Nickel Eyelets.  This item 1286-12 is used to attach key plates and reinforce holes to prevent tearing on the material or leather that you are working on.  The setter and anvil for these is item # 8094-00.  Thank you for looking.