Adapter or adaptor? We're not quite sure. Over the years we've used both and still get confused. Ever stare at a word so long it stops looking like a word? Adapter. Regardless of how you spell it, this 3-pack is the same OEM adaptor that comes with the ATX for use with the HB4 and HB6 line of blades. The HB4 and HB6 Blade Kits come with one extra adaptor.