タイトルまたは説明

New type of fixed handcuffs, convenient to detain criminals
 Specifications：
1. Handcuffs length **6mm
2. Handcuffs lower and upper plates thickness 2.5mm
3. Adjustable *1 gears grooves, gear thickness 3.5mm
4. When first gear is locked, the maximum internal diameter is *2.8mm
5. When last gear is locked, the minimum internal diameter is *4.8mm
6. Weight **8g (not including keys)
7. Accessory: 2 keys for each set of handcuffs, Key length *3.5mm