Prong Collar Leash Adapter

I am so glad this finally happened. I have the original ones but I walk my dogs on 50 foot long lines and thought of how to attach it safely to the long line. I thought of asking you for this or just having it cut and working something out myself because this double protection is definitely the way to go. I do believe for my dogs safety that having this done right is the best choice. I am ordering 2 of them today.
Thank you
Anne