The parallel guide extrusion is compatible with Mafell, Bosch & Bosch GKT FSN Tracks. A simple system to connect. Slide in and tighten the thumbscrews, set your stop and away you go. Please Note: You will need to add joiners if required. The extrusions are available as either 6 x 330mm sections or 4 x 440mm sections Available in Metric or Imperial330 Sections can achieve cuts of the following Section 1 -500mmWith Sections 1 & 2 - 830mmWith All Sections - 1160mm 445 Sections can achieve cuts of the following Section 1 - 620mm With All Sections - 1060mm All markings on the tracks are laser engraved. Calibration can easily be achieved by loosening two screws and moving to your cut line's desired measurement. THIS PRODUCT IS COMPATIBLE WITH BOSCH GKT PLUNGE SAWS Download the Manual Click here to see all our Instruction Manuals.