Check the listing for details. Key Chain Quick Release Magnet Copper Rare Earth Automatic Connect Disconnect. Color: Copper, Condition: New. Listed at 15.95 USD. Key Chain and Ring Magnetic Separator - Copper Quick Link Set Part Number:QRC-01 Case Material:Copper Magnet Grade :N52 Magnet pull force:6 bs. / 2.5 kgs Dimensions:1.25" x 0.375" 0.3 ozs. Primary Use:Keychain breakaway, automatic recoupler Secondary Use:Fly fishing net release or tool hanger Copper Body Quick Release Magnet Pair, Made in the USA Contains the strongest grade (N52) neodymium rare Earth cylinder magnets. Each half of the pair has a 5/16" (8mm) N52 neodymium cylinder magnet. These are press fit into a machined copper housing, which accommodates a split ring on each side. The dimensions are 3/8" (9.5mm) diameter by 1.25" (32mm) long (not including the rings). Some of the uses include: Key or keychain quick release (save your ignition from excess weight, and keep your keys from slapping and scratching the dashboard) Use each half independently as a magnetic key hanger (store key sets on almost any steel surface, like a refrigerator or file cabinet)Disconnect only your necessary keys for valet use, and keep your house keys and other key ring accessories safe. Test metals, including industrial scrap, antiques, and jewelry for ferrous content (steel and iron). This should always be the first test performed on questionable jewelry, gold and silver are never magnetic.Set includes (2) quick connect magnets, (2) 1" split rings, and (2) 1/2" split rings. Use them in any combination to suit your needs. Handy Magnets are manufactured in the USA by Revolution Machines LLC