Chrome Vanadium Steel Construction. Satin Chrome Finish For Easy Cleaning and Rust Resistance. Fully Polished. Heat Treated for Strength. Precision Machined. Sizes: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 32mm. Heavy Duty Storage Wallet.