Unbelievably strong Neodymium magnet base with steel split ring key holder * Neodymium alloy produces strongest permanent magnets known - stronger than rare earth magnets * 1" magnetic base holds to any ferrous (iron-containing) metal surface with up to 35 lb force * 1-14" thick steel split ring, separates for adding keys, etc, non-rust nickel plating * Great for keys & other important items you don"t want to lose; bright chrome finish