Usage Tips:Features: Made of high-quality materials, high strength, high hardness, and practical. Using tiny adjustable magnets, help you install your planer blade so it aligns precisely. Adopts heavy duty magnets and can hold blade up to 20 inch length. design, no need to down, easy to use. Fits for all makes and models of 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 blades 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. Saving Device when mounting and setting planer blades. Specifications: Minimum cutter shaft diameter: 75mm Maximum cutter shaft diameter: 125 mm Height adjustment: 22 mm Incremental adjustment: 0.15 mm Magnetic Planer Knife Blade Setting Jig Height Setter Tool Leaves hands free to adjust jigs and cutter head Keeps knives in alignment while setting Simple to use Material: Metal colour: black Package Contents: 2 x Planer Blade Calibrators Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.