The Roor reducing adaptor allows you to reduce the size of your ground notch from either 29.2 to 18.8 or from 18.8 to 14.5 so you can use these smaller parts on the larger size ground notch.
The Roor reducing adaptor allows you to reduce the size of your ground notch from either 29.2 to 18.8 or from 18.8 to 14.5 so you can use these smaller parts on the larger size ground notch.