1. With planer knives, each within a frame with magnets for secure attachment to a cutterhead. Simply place the gauge over the cutting tool and then adjust the correct height of the cutting tool. 2. Adjustable planer knife calibration gauge setting tool for woodworking tools, compatible with all brands and models of surface planers, jointer planers, and combination planers/thickness planers. Can be used on planers and jointer planers. 1/8' cutterheads, for precise leveling blade adjustment. 3. Simplifies the adjustment and setting of cutting tools in a cutterhead, stabilizing the cutting tool blade. A timesaving device when mounting and adjusting planer knives. 4. Made from quality material, strength and hardness, durable and practical. Uses an adjustable mini magnet to help install planer knives in alignment with precision. Features performance magnets and holds knives up to a length of 20'.