Malco FG1 Hole Cutter for Fiberglass Duct Go to amazon.com Related posts Top duct knife malco FeatureDurable extruded aluminum frame and engineering grade molded plastic and nylon components.Blade holder stores in body for safety and to protect blade from damage when not in use DescriptionFG1, Malco Products, Inc., FG1 DB DUCT HOLE CUTTER 50184