Includes plate, stud, and 1/2" 13mm drill chuck and key.
Sand and clean the plate, weld in center stud bend wings to fit your own digital angle finder.
*** I reccommend Wixey wr300 type 2, or Klien 935DAG. Both measure 180*×2 For full 360* range.****
You can also use generic 90*×4 angle gauge, but it can get confusing keeping track of the numbers.