The FSK cross cutting guide rails work in combination with the Festool HKC 55 cordless circular saw. The two together form an easily portable and highly accurate cross cut system allowing precision square and mitre cuts. The level of accuracy produced is normally only experienced using a static mitre saw. The Festool system is more convenient especially when working in situations where a large mitre saw in impractical. The rails feature an adjustable stop system that allows for angled cuts from 0 to 60° both left and right, with stops at common angles. A quick-acting closure allows you to quickly attach or detach your saw. An adjustable starting position stop with built-in rubber spring helps reset the saw ready for the next cut. Length of cut stated is with the saw's 55mm maximum depth; shallower depth settings will slightly increase the potential length of the cut.