The Bosch FSN A connects to the base of compatible Bosch jigsaws and enables them to be used with the Bosch professional FSN guide rail system as well as track saw rails from Festool and Mafell. Compatible with the following machines: • GST 160 • GST 140 • GST 1400 • GST 18 V-LI • GST 18 V-LI S • GST 18 V-LI B Features and Benefits • Compatible with Bosch FSN guide rails as well as Mafell and Festool rails • Easy, tool-free connecting and separating of jigsaw and adaptor