From the Manufacturer
MLCS planer jointer knife setting jig. Micro adjustable to 0.001-Inch. For both steel and carbide knives. The revolutionary design of this jig allows you to save time and effort while setting up jointer or planer knives quickly and accurately. The setting jig holds the knife firmly in position, freeing both hands for adjustment and tightening of the knife. This product also provides priceless added safety by allowing hands-free tightening, keeping fingers safe from razor sharp cutter knives.