Defective Closeout Sale, 45# Steel Eyelets Installation Tools, Stainless Steel ColorSize: about 100mm long, 16mm wide; pedestal: 19x19.5mm, hole: 9.5mm.â Each Set includes: A metal Mandrel of 3.93 length & a metal base with hole 0.37 inch in diameter. â MateriaL: Made of 45# steel, hard enough, not easy to deform after repeated hammer. â Usage: This eyelet installation kit is fit for repairing leather, curtains, canvas, fabric, or as an embellishemnt for clothes, bags, belts. â How to Use: Just place the metal base under the metal eyelet and strike the metal mandrel with a hammer. â Tips: The surface is a little yellow, but does not affect the use.