Surface Treatment: Electroplating [Size]: inner diameter 1.6 cm, inner diameter 2 cm, inner diameter 2.5 cm, inner diameter 3.2 cm, inner diameter 3.8 cm [Scope of application] luggage accessories, leather bags, clothing accessories, shoe accessories, DIY handmade Installation methodAccording to the actual hole distance specification of the product, determine the size, and then use stamping/rivets/screw/spot welding to operate. Precautions Do not wash the surface with water, sulfuric acid, or acid. Do not use a polisher to polish this product. If the product is to be welded, please use the blank product for operation to avoid high temperature burnout of the electroplating layer. [Storage method] Store in a dry place, do not stack in a humid, cool place to avoid rusting or oxidation of the product.