Lingual Torquing Key, .018" Lingual Torquing Key, .018" TK018 Designed for proper wire placement and improved torque expression in an .018" slot lingual system. Where to Buy x Category Dealer PartnersSales RepresentativeStrategic MarketsSchools RepresentativeAccutron™ Equipment Sales Zip Code Find RepresentativeReset Select a category, input a zip code and click on Find Representative, or explore the complete list here.