Hello, I think i hit on bug when making countersing hole under DIN 7991 standard.

The hole is not big enough to fit DIN 7991 screw.

link to screen:     http://s27.postimg.org/8j0mipsw3/image.jpg

link to standard:  http://mdmetric.com/fastindx/uc52_56.pdf

Thanks for any hints,

Martin