The AT312 can be used on any Chef or Major kitchen machine. It attaches to the high speed outlet.AT960 is a medium speed attachment and can only be used on Titanium models KM001, KM002, KM010, KM020, KM030, KMC030, KMC015, KM023, KMC023, KM013, KMC013, KMC010 and KMM020.