Mini Planer Pals® are patented magnetic knife setting jigs for all 10" - 12" portable planers with standard 1-7/8" - 2-1/8" cutterheads. With over 1 million of these planers on the market, the Mini Planer Pal® is a very popular tool. The Mini Planer Pal® allows you to set knives perfectly every time to within + or - 0.001". Sold in pairs only. Precision-crafted in the USA.