Fangrui Product Details Features: Made Of High-quality Materials, High Strength, High Hardness, Durable And Practical. Using Tiny Adjustable Magnets, Will Help You Install Your New Planer Blade So It Aligns Precisely. Adopts Heavy Duty Magnets And Can Hold Blade Up To 20 Inch Length. Unique Design, No Need To Press Down, Easy To Use. Fits For All Makes And Models Of Surface Planers, Jointers And Combination Planer/ Thicknessers. Can Be Used On The Planers And Jointers, Even Molder Heads With 2-9/16 Inch To 5-1/8 Inch Cutterheads. Designed To Adjust Leveling Precisely. With Two Planer Blade, Each Within A Framework With Magnets For Firmly Attaching To A Cutter For Head. Simply Place The Gauge Assembly Over The Cutting Tool And Then Adjust For The Correct Cutting Tool Height. Simplify Setting And Adjusting Cutting Tool In A Cutter For Head By Stabilizing The Cutting Tool Blade. For Time Saving Device When Mounting And Setting Planer . Specifications: Minimum Cutter Shaft Diameter: 75mm Maximum Cutter Shaft Diameter: 125 Mm He