A compact steel collar with defined character. This neck restraint is based on the Chicago Model 2500 oversized boot cuff, adapted for use as a structured collar. Its construction allows for precise adjustment, making it suitable for smaller neck sizes while maintaining a firm and consistent fit. The integrated double lock system increases control during use and helps prevent unintended tightening once secured. A short guide chain connects the locking elements and reinforces the industrial character of the piece. The collar is intended for structured restraint setups rather than continuous wear. Technical details: Model base: Chicago Model 2500 oversized boot cuff Locking: double lock mechanism Inner circumference range: approx. 28.3 cm – 38.7 cm Guide chain length: 18 cm Weight: approx. 420 g Smallest opening: 9.4 x 9 cm Largest opening: 14 x 9.5 cm Recommended for: neck circumference up to approx. 340 mm Included: collar and two keys