- Simplifies setting and adjusting the cutting tool in a single cutter head, stabilizing the blade to save time when mounting and adjusting planer knives - Adjustable calibrator knife tool for woodworking tools, compatible with all brands and models of surface planers, jointers, and combination planers/thicknessers; suitable for use on both planers and jointers; 1/8 blade heads for precise leveling of knives - Each blade is housed within a frame with magnets for secure attachment to a cutter head. Place the gauge over the cutting tool and set the correct height of the tool - Made from high quality material with high strength and hardness for durability and practicality. Uses an adjustable mini-magnet to help install new planer blades in perfect alignment with precision; high power magnets hold the blade up to a length of 20