Top & Bottom surface magnet.
The magnetic section on one side is separated so as to adapt itself to the surface of the instrument, tool or part to be held.
The opposite side attracts itself to any metal surface on any machine.
Converts your surface gage into a magnetic unit and also be used as a grinding chuck for small grinding operations.
Top & bottom parallel within .001".
3-1/2" long x 2-1/2" wide x 7/8" high.