Duct Hole Cutter Blade Length 1 1/2 in Blade Material Steel Blade Shape Straight Blade Type Straight Cutting Action Counter Clockwise Cutting Capacity 1 in Depth of Cut 4 in to 20 in Blade Edge Type Straight Features Components can be Protected When Not in Use Heavy Duty Components Knife Type Fiberglass Duct Board Hole Cutter Material Application Duct Board Maximum Material Thickness 1.5 in Number of Cutting Edges 1 Overall Length 5 in Point Type Double Point