High Quality Material Structure Made of High Quality Steel with Heilwiy High Hardness, Abrasion Resistant And Durable. It Is Used to Open Holes In Iron Plate, Aluminum Plate, Wood, Plastic, Plasterboard, Etc. .High Performance: Smooth And Very Precise Arte Drill Set. Sharp tooth Shape, Low Vibration, Fast Balance When Opening Holes, Making The Operation More Stable Wooden tooth-Shaped Hole Saw Tilted forward And Backward, Fast Cutting Speed Compared An Ordinary Column Saw, Not Easy to Jam Or Pull The Teeth.Powerful Features Hole Saws High Speed Steel Cutting Edge Provides Impact-Resistant Teeth And Resists tooth Pulling. Soft Spring Steel Creates A Flexible Substrate That Allows The Hole Saw to Absorb Shock While Drilling Holes In Hard-to-Cut Materials. .Note Cut Wood, Plastic And Thin Metal Smoothly And Quickly. It Should Be Drilled Clockwise. .Perfect for Heilwiy Multiple Purposes: Can Drill Suitable for Heilwiy Cork Board, Plywood, Oak, Thin Pvc Sheet, Plastic, Drywall, Steel, Cast Iron, Aluminum Aluminum Alloy, Etc. .