specification:
1. Handcuffs 230mm in length
2. The thickness of the lower and upper plates of handcuffs is 2.5mm
3. Adjustable 20 speeds, with groove, 3.5mm gear thickness
4. When the first gear is locked, the maximum inner diameter is 78mm
5. When the last gear is locked, the minimum inner diameter is 50mm
6. Two-stage lock or three-stage lock
7. Weight 276g (excluding key)
8. Accessories: 2 keys per set of handcuffs, key length 43.5mm
9. Two or three-piece hand arrows inside handcuffs, 3 teeth each