The W1857 8" Jointer with Mobile base is a feature packed machine with so much to offer including a thermal protection switch, built-in Mobile base, heavy duty cast iron hand wheels, and Taiwanese build quality. Also, you'll get 25% more cuts per minute than with a four-knife cutterhead, which leaves a smoother finish and requires less sanding than the typical three knife models. Step up to this larger capacity 8" Jointer and be confident that you Made a great decision! Csa Certified meeting CSA C22. 2 #71. 2-10 and UL 987 8th Edition standards!