1、Copper material will not rust. The fastener necktie strap is suitable for a variety of bow tie, necktie and great for DIY. These are the clips for a bowtie and neckties bow ties, pocket squares, handkerchiefs, for adjusting the circumference of the neck necessary for a bowtie. 2、The fastener necktie strap uses copper material which will not rust, light weight, beautiful plating and durable in use. 3、This bow tie hardware clip can keep your necktie straight and in place at all times when in use, will not damage your neckties. 4、Ultra‑thin, useful hook fastener for comfortable bow tie wearing, perfect for making your adjustable bow ties or necktie. 5、Keeping your necktie straight and in place at all times. Will not damage your neckties like tie pins or tie clips. Makes a great gift with this tie hardware set for father's day, anniversary, or any other holiday. Feature: Copper material will not rust; Ultra-thin, space; 20mm width, to accommodate a variety of tie. Specification: Material: Metal Copper Color: Silver Size: 20mm(ID) Inner Diameter:18mm Outside Diameter: 23mm No rust, thin, DIY tie. For Bow Tie,DIY. Please confirm the size before you buy. Package include: 50x Bow Tie Clips Note: Please allow 1-3mm error due to manual measurement. Thanks for your understanding.