Precision compass with spring-bow head and centre wheel.  Solid metal compass. 

Hinged leg joint and needle shoe.  Interchangeable lead part with shank. 

Interchangeable shouldered needle. 

Maximum circle approx. 265mm, with extension bar approx. 500mm.  Length 154mm. 

Compass comes with extension bar, universal adapter and spares box in case with hinged lid.