... surfaceReal factory priceOrther cap size: Full range size available NameValueMaterialBrass or IronColorShining Nickel,Black nickel, gold,antique brassSizeOUter Diamater 9.8mm, Inner 5mm, Height ... , square ring,Oval ring,rectangle ring and etc)5.Orther metal products apply on garment, shoe, luggage,belt. 9.8mm outer size round metal grommets eyelets