I nkow the type you mean they are very good......i got one off DDD that is spot on, its the same kind of clip on the slips that release the whole lot, but this just slips through the collar and locks in place, so when you slip the collar is on, i gave him exact measurments for mine, as i find the shop bought ones all just slightly the wrong length, and it fits perfect!!!!! No reaching down or trying to scoop a bit up as your dog pulls to be off, its just right there, next to your thumb ready for action.........