Description: Satin chrome iron material, rustproof; Easily install and operate; Used as a security locking device for safe viewing and ventilation, stop theft; 170mm/ 6.69inch chain length, free easy to lock; Cannot be unlocked from the outside, locked from inside, providing a safe living condition; Specification: Material: iron chain length:170mm/ 6.69inch; Lock plate(LxWxH): 85x37x10mm/ 3.35x1.46x0.39inch; Fixed lock plate(LxWxH): 48x22x10mm/ 1.89x0.87x0.39inch; Package Includes: 1 piece door chain Note: Due to the manual measurement, there is a slight difference between the size from the above and the actual item. Because of the displaying and lighting effects, monitor settings,etc.there could be a little color difference acceptable, please kindly note. If you have any questions,please feel free to contact us in any minutes, we are glad to solve your problem. Enjoy your shopping !