ZFE Adapter 5/8'' 11 to 6mm shank for Electric drill - Drill adapter for Backing Plate/Pad Adapter 5/8'' 11 to 6mm shank for Electric drill - Drill adapter for Backing Plate/Pad 5/8"-11 male thread to 6mm shank Allows you to use 5/8"-11 backing pad with any hand held power drill. This gives more options on tooling and machines the backing pads can be used for. The Highest quality hardened steel.