Three-Number Instrument

Function :-

Numbers on handle indicate width, length, and angle of blade
1 Indicates width of blade in tenths of millimeters
Example: 20 indicates a width of 2 mm
2 Indicates length of blade in millimeters
Example: 8 indicates a length of 8 mm
3 Indicates angle of blade from long axis of shaft

Example: 12 indicates an angle of 12 degrees

The designation for the instrument described above is 20-8-12; the number of instrument size is
indicated on the handle.
Examples of three-numbered instruments: Enamel Hatchet, Enamel Hoe, Wedelstaedt