PRINCIPISimplifies setting and adjusting knives in a cutterhead by stabilizing the knife blade.Easy to useSimply place the gauge on the knife and adjust the correct knife height.Wide Application The easiest and most effective way to restore blades, fits most blade planers. Perfect Performance Using a pair of micro-adjustable magnets, this mask will help you install new planer blades in perfect alignment with precision.Specifications:Material: Steel.Cutting block minimum diameter: 75 mmMaximum diameter of the automatic cutter: 125 mmHeight adjustment: 22 mmProgressive adjustment: 0.15 mm. Weight: 370g (approx.).Contents:2 masks for planer blade adjustment.1 wooden box. Note: The data are all manual measurement, please allow 1-3cm error , due to the light and display difference, there will be some color difference, depending on the physical object received.