Equipment Lock HDCDL Steel Heavy Duty Cargo Door Lock Keyed lock to secure both doors of a semi-trailer or storage container Adjustable to fit doors with vertical locking bars from 9-3/4" to 16" apart Made of two square steel tubes, one 2" and one 2-1/2", with 3/16 thick walls Powder-coated orange for high visibility and to help resist corrosion.Made with a tubular pin tumbler lock for pick resistance An extension is available for the Heavy Duty Cargo Door Lock for odd size container bars 17-23 inches apart.