The Festool Carvex Circle Cutter Imperial works with all Festool Carvex jigsaw models to cut circles from 4-3/8" to nearly 10 feet (9' 10-1/8" ) in diameter. Requires use with the optional Guide Rail Base Adapter (#497303). The Circle Cutter rolls up for compact storage when not in use. For best results, Festool recommends use of a scroll type blade, such as the S 75/4 K or S 50/1.4 FSG (#'s 486563 or 486564) when making circle cuts. Germany