Economy-priced, but technically good construction, pressure lever mechanism with automatic spindle and centre wheel, 2 knee joints, by attaching adaptor with 4 mm dia. spigot all commercial technical pens can be used, working range up to 370 mm Ø, with extension bar 620 mm Ø, mat nickel plated, lead box, in transparent covered box. Material zink diecasting. Ref. 421711 with extension bar adaptor
