Loose leaf binder ring is a wide application office supply, great for variety of uses such as loose-leaf, sheets, memo filing, memos, invoices, key rings and sample holders. Strong nickel plating won't crack, bend or rust. Made of durable, long-lasting materials that are perfect for your every day needs. Features - Color: Silver. - Material: Metal. - Size: 35mm (Inner Diameter); 40mm (Outer Diameter). - Easy to use: pull to open, squeeze to close, lock for additional security. - Great for variety of uses such as loose-leaf, memo, key rings, invoices, swatches and sample holders. - Made of sturdy metal material which can withstand heavy use. Strong nickel plating won't crack, bend or rust. - These book rings are made of nickel plated metal to create a smooth surface and silver finish.