This listing is for a pack of 8, durable metal construction with solid brass air release button. These are perfect for installing in your airline with your tools so you will be able to easily blow off your work surface without having to detatch any tools you have hooked up. These feature a rubber tip to avoid any accidental damage to your work surfaces. This would work great in your shop, or in your store. Comes with a retail display making it easy to show off on your shelf or counter if you are retailing this item.