The Mini Honing Guide allows you to easily and quickly get that perfect cutting edge back onto your plane irons. Slip the iron into the device so that the bevel touches a flat surface and so both rollers are firmly grounded and lock it into place with the knob. Run this set up over your honing stone with the certainty that the angle is perfect and the bevel is parallel across the iron. Works with your HP-8 Mini Block Plane Iron and the Chopstick Master Plane Iron. Your plane irons should be honed frequently for the best performance. Irons which become worn or nicked will need to be ground first before being honed.