Great Planes Precision Hinge Marking Tool FEATURES: Pivoting Feet Conform To The Surface, Virtually Eliminating Gouging; Steel Scoring Pin Won't Wear Out Like Plastic Ones; Can Be Used On Cont. INCLUDES: One Precision Center Marking Tool Body One Threaded Scoring Pin Two Pivoting Feet REQUIRES: (Original units required an 050 wrench; items shipped after August of 1999 include a .050 hex wrench) COMMENTS: Control Surface Hinges Must