his quality emergency safety Kit with whistle, Carabiner IDl Holder & key chain is great for any situation and it lets out quit a blast. The waterproof capsule body measures 3/8" in diameter by 1 -7/8" long excluding the key ring. Great for boating, camping, hiking personal safety, and geocaching. The Carabiner will clip to a belt loop, back pack, purse, Go Bag. Material : Aluminium • Size 2.75" x 7mm NOT for Climbing. The ID Holder 48 ID Holders in a Display Box • Assorted Colors: Red , Blue, Black, Silver, Green and Purple • Length : 2-1/2" • Diameter: 3/4" • Aluminium Body • Flat Bottom • Plastic Coated Interior • O- Ring Around Cap to make Holder Water Resistant • Can be Clipped to Keychains, Handbags, Jackets Etc • Great for Kids and Elderly to Carry Personal and Emergency Information