Package Includes: 50 pcs ID number tags, 50 pcs key rings, and a plastic transparent storage box. Includes numbers 1 to 50, which can fully meet your needs. Size: Each metal numbered tag measures 23x23mm. The hole diameter for number tags 1-30 is 1.5mm, with matching key rings sized 14x14mm. The hole diameter for number tags 31-50 is 2.6mm, with matching key rings sized 20x1.5mm. The clear plastic storage box measures 125x85x18mm. Stainless Steel Material: Metal number tags are made of high-quality stainless steel, durable, waterproof, and easy to clean, suitable for various occasions. The hollow design adds texture. Suitable for Group Activities: Ideal for use in sports events, classroom activities, parties, and other group gatherings where quick identification is needed. Widely Used: Metal number tags can be used as keychains, for labeling door keys, cardholders, suitcases, lockers, storage boxes, cabinets, bicycles, and cups with handles, providing an effective solution for identification and organization in multiple settings.