The Smith and Wesson Model 100 Handcuffs are the best handcuffs when it comes to top security cuffing. The Smith and Wesson Model 100 Handcuffs are N.I.J. approved high quality carbon steel with chain connection. The handcuffs are self locking single lock. The have easy access double lock on top. The Smith and Wesson Handcuffs come with 2 keys. They are 9 inches in length. Made in the USA. Available in Nickel Silver.