The distance between hole and edge should be a minimum of two stock thicknesses. Should include a bend relief notch to avoid cracking or fracture.
Constraints are particularly important in harder stock.
The line of sharp V-bend should not be parallel with the grain direction, otherwise cracking or fracture is likely to occur. Burrs are a result of the normal stamping process. Burrs on the outside of a bend may create fractures. Burrs can be removed utilizing a number of different processes. Round is the easiest to draw, followed by square with adequate corner radii.