The security features of the ring are two staged. The clamp cannot be opened or installed without a Torx® T10 pin driver. This security screw has the raised pin in the center of the star to prevent standard Torx® drivers from use. Inside the clamp is a second security feature, a steel ring with a 1.5mm hex set screw that locks the ends of the cables together. The unit is shipped with four Torx® Pin screws and nuts. Two are extra in case of loss. Liberty item T10PD is a simple tool kit of a T10 pin driver and a 1.5mm hex wrench. The T10PD is sold separately.