Tunneling Knife 1, Black Line Tunneling Knife 1, Black Line TKN1X For incisions that remove or recontour soft tissue. Also useful to excise interproximal tissue. 1.8mm/2.4mm 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.