Ray Foster MR20 Model Arch TrimmerProduct Description Ray Foster MR20 Fast and easy removal of the arch or palate areas of gypsum and stone models is accomplished with Ray Foster Model Arch Trimmer and SaburTooth Carbide Burs. Model MR20 Model Arch Trimmer FeaturesFeatures Large, stainless steel work surface with generous venting for dust removal 1 1 2 (38mm) hose connection, connects directly to 1 1 2 vacuum hose, no need for adaptors Power output connection for automatic on off of