Ok, they worked fine to
"Ok, they worked fine to replace an old stripping set of chainring bolts (frequently off/on a bike that is shipped to events). But. Fine front for 5mm hex. The back is old style cross bar. I ended up using a steel nail file on my knife and the side of a putty knife to hold the back while tightening the front. Be prepared if you have to get these! BTW, Park Tool makes CNR-2 tool that specifically will hold these. I hope. I'm getting one, the back of my RD hangar also is made this way."
