M300-1 Hinge-Type Handcuffs by Smith & Wesson Includes one key Manufacturer: Smith & Wesson Model Name: M300-1 Type: Hinge type (type where two handcuff bodies are connected by a hinge) Finish: Nickel finish (judging from the image) Manufacturing Location: Houlton, Maine, USA (from the stamp) This model is designed with a wide opening for people with large wrists and a narrow closing for people with thin wrists. This type of hinged handcuff is characterized by its ability to restrict the movement of the subject more effectively than general chain handcuffs. This is because the two handcuff bodies are connected by a fixed hinge, which keeps the distance between the wrists constant. Thank you for viewing.