1. Adjustable Planer Knife Calibration Gauge Setting Tool for Woodworking Tools, Fits All Brands and Models of Surface Planers, Jointer Planers, and Combination Planers/Thickness Planers, Can Be Used for Planer and Jointer Planers. 1/8' Knife Heads, For Precise Blade Leveling Adjustment. 2. Simplifies the adjustment and setting of cutting tools in a cutterhead, stabilizes the cutting tool blade. A timesaving device for mounting and adjusting planer knives. 3. Made of quality, strength, and hardness materials, durable and practical. Features an adjustable mini magnet to help install planer knives in alignment with precision. Equipped with performance magnets to hold knives up to a length of 20'. 4. Works with planer knives, each within a frame with magnets for secure attachment to a cutterhead. Simply place the gauge over the cutting tool and adjust the correct height of the cutting tool.