They are lethal! That's what they were meant forAlso, be sure to keep those spurs trimmed down. As a newbie, I made the mistake of not catching that in time and my big barred rock rooster injured one of my hens under her wing with one of his spurs. She was a Black Marans and I didn’t see blood until it was too late. By the time she started acting strange, nothing I did saved her from that point.
Those spurs can be lethal.