Festool 561432 TS 55 EQ Plunge Cut Circular Saw When used with Festool guide rails, you can achieve perfectly straight and splinter-free cuts. Spring-loaded riving knife (splitter) keeps the cut kerf open so that the material does not pinch the blade. This reduces the chance of kickback. The slip clutch helps to minimize the risk of a kickback and minimizes wear on the blade, gear case, and motor. Blade changes are easier and safer using the FastFix system which locks switch and arbor simultaneously for easy arbor bolt removal. MMC electronics provide soft start, variable speed, constant speed under load, and current and thermal overlad protection.