Fits onto the nozzle end of the blowpipe, between the head and the cutting nozzle. Offers optimum two-handed control, fitted with a sliding centre device and a roller ball support spigot, ideal for accurately cutting larger diameters. Swing arm is graduated for direct reading of circle diameter (2 x radius). High quality brass head and screws with chrome plated steel swing arm and centre slide. Compatible with most blowpipes including 1144, 1143, NMC200, NM250, NM400 etc. Also compatible with cutting attachments.