Review on 🚲 JTDEAL Bicycle Wrench: Carbon Steel Bottom Bracket Spanner for Shimano Hollowtech 2 - Install & Removal Tool (22CM Length) by Mark Howard

I thought a piece of sheet metal could be stamped to an accurate enough size to make some grooves but this manufacturer couldn't. Will not fit my BB or any of my center lock rotors. It looks like the radius is too small or at least some of the teeth are sticking out too far. Even if it did fit, it would be so rough that every aluminum and taut piece would deform. I'm also not sure what the round piece on the other end is for, but it's plastic and doesn't require a lot of torque before it breaks.