These specially designed machine bits have a specially designed form of scriber to allow use at high speeds.  For recessing circular hinges.  For accurate repetitive routing, a template and guide bush fitted to the router base should be used.
Specification:
D=35 mm|OL=71.5 mm|Shank Diameter=8 mm|Recommended speed=1000-20000 rpm
    
    
    Specification:
D=35 mm|OL=71.5 mm|Shank Diameter=8 mm|Recommended speed=1000-20000 rpm
        12 months