SINEDY 1pc Magnet Key Hook Attachment Chain Ring Brand new and high quality. It comes with a split ring for easy carrying. It has an excellent feel and is very sensitive. The perfect size and strength for identifying fake stainless steel. Please note: Due to their strength they all have the potential to damage credit cards or other items with a magnetic strip if they are kept too close, but cell phones, electronics, and car keys with embedded micro chips are fine. The brass casing protects the magnet from chipping and breaking, and makes removing iron and steel shavings much easier. Ideal For Metal Recyclers, Brokers, Antique Buyers, Hobbyists and Collectors. Identify plated stainless steel, where steel or nickel are often the base metals. Identify/sort (fake) stainless steel, solid brass and bronze from plated steel items. Size:7.5cm x 1.2cm x 1.2 cm - 2.95inch x 0.47inch x 0.47inch. Key Ring:2.5cm x 2.5cm - 0.98inch x 0.98inch.