Suitable for all types of jointers and thicknessers. Simply adjust the jigs for the correct diameter cutterhead and length of extrusion of the blade from the cutterhead. Put your planer knives into the cutterhead and set the jig over the planer blade. Two rare-earth magnets hold the jig onto the cutterhead whilst pressure is being applied to the knives for tightening the clamping bar. Allows perfect setting of blades on any type of cutterhead.