Marking tunnel for future ring position with initial lines for incisions. 
  Internal diameter 4.00 mm. 
  External diameter 6.00 mm. 
  Creates 2.00 mm lines.  
 40°  angled to handle. 
13-143_tunnel-zone_marker,16-173s-tunnel_maker,2-010s-castroviejo_caliper,4-057t-catalano_corneal_forceps,20-050_disposable_marking_pen_double-ended,18-304-plastic_sterilizing_tray