77/78 Heavy Margin Trimmer 77/78 Heavy Margin Trimmer MT77/78H 15-96-8-12 Margin Trimmer used to produce proper bevel on enamel margins. Similar to a hatchet except the blade is curved and the cutting edge angled. 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.