Most quilters prefer to manually fold the binding fabric in half. Raw edges are sewn together and the folded edge of the binding is wrapped around to the other side of the quilt. This creates a double fold of fabric at the quilt's edge.
The Clover bias binders make two folds in the fabric, which the cut edges meeting in the middle of the back. If applied as binding, this results in a single layer of fabric at the binding edge. Most quilters do not use the Clover bias binders to make quilt bindings.
I do love the Clover bias binders for making applique stems for flowers; I just wouldn't use one to make a quilt binding.