Features: Using micro-adjustable magnet, this jig will help you install new planer blades in perfect alignment with accuracy. The easiest and most efficient way to reset your blades, fits most planer blades. Simplify setting and adjusting knives in a cutter head by stabilizing the knife blade. The system consists of two gauges each within a framework featuring magnets for firmly attaching to a cutter head. Simply place the gauge assembly over the knife and then adjust for the correct knife height. Specifications: Material: Steel Minimum Cutting Block Diameter: 75 mm Maximum Cutter Diameter: 125 mm Height Adjustment: 22 mm Incremental Adjustment: 0.15 mm Weight: 370gapprox. Package Includes: 2 x Planer Blade Setting Jigs 1 x Wood Box