This Silver Pill / ID Holder Keychain is a must-have for anyone who needs to carry small items on the go. With its compact size of 2 inches in length and 1 inch in width, it can easily fit in your pocket or attach to your keychain. The holder is made of durable stainless steel and comes with a waterproof gasket ring, making it perfect for outdoor activities. The Vernier type caliper has a measurement system of standard (SAE) and is manually operated. The model PH21-48 is manufactured in China and weighs only 0.6 oz. It is an excellent accessory for those who need to keep their pills or IDs safe and secure.