ITEM NAME:10pcs Heavy Duty Key Rings Split Open Hook Spring Key Chain 20mm Description: The round carabiner keychain is made of zinc alloy. Light weight, high strength and highly resistant to corrosion. Spring clip design, quick release. It is very convenient to take along. Easy to operate with the built-in spring. Exquisitely workmanship and appearance. Used for daily life, attached to the backpack, handbag, or use as a keyring. Specification: Material: Zinc Alloy 1 #: Outer Diamater: Approx. 20mm/0.78in, Inner Diameter: Approx.13mm/0.51in, Thickness: 3mm/0.11in 2#: Outer Diamater: Approx. 25mm/0.98in, Inner Diameter: Approx.17mm/0.66in, Thickness: 3mm/0.11in Color: Silver Package Includes: 5 Pieces 20mm Roud Carabiners 5 Pieces 25mm Roud Carabiners Note: Not for climbing or safety equipment. Due to the differences between different monitors, the picture may not reflect the actual color. There is 2-3% difference according to manual measurement, please check the size carefully before you buy the item. Thanks! SKU: DMO0021078219517608.5 Pieces 20mm Roud Carabiners. Spring clip design, quick release. It is very convenient to take along. Easy to operate with the built-in spring. The round carabiner keychain is made of zinc alloy.