Search online and you will find them. Amazon sells a sort of bit but it is not nearly as good as the Bumpa Bits. I ordered mine from Canada ... not expensive - a little over $7 for 12 of them. They work so great and do not hurt the hen in any way.
I have two bully hens in my flock. They have pecked most of the other chickens badly, some of them bleeding. I have increased their protein, their pen is huge and it turns out they are just bullies!
I purchased some Bumpa Bits ... ordered them from Canada ..... and put them on. They sure...