Check the listing for details. 10 Metal Collar Neck Waist Extender Expander Buttons for Men Dress Shirt Pants. Color: Silver, Condition: New with tags. Listed at 7.99 USD. YOUR BREATHING ROOM BACK: Opt for premium comfort and expand your dress shirt collars by ½ neck size to make them more comfortable to wear and save money from replacing too tight neck shirts. TOP QUALITY: Collar extenders make your durable buddy for lifelong use. Made from environmentally friendly, super-durable zinc alloy. CONVENIENTLY DISCREET: Just 10mm (3/8”) in diameter, those neck extenders are your secret ally for peerless comfort and a unique sense of freedom in use! EASY TO USE: Attached in less than 5 seconds. No sewing is required to attach our metal shirt collar extenders to your shirt! Simply loop one around your shirt button or daisy chain a pair of them together for even more space.