20 Hirschfield Periosteal 20 Hirschfield Periosteal P20 Periosteal Elevators are designed for reflecting and retracting the mucoperiosteum after incisions of the gingival tissue. 3.4mm/3.7mm 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.