tough wheels for revo

so i have stripped 3 wheel hexes in my first week of 5s medusa 60mm 2000kv brushless i apparently need an upgrade, what is the toughest wheel hex to get besides aluminum wheels. i don't care about looks i just bash. i had aluminum hex's for the wheels that stripped, which were stock e-maxx /revo wheel/ tires.


... also how do i keep track of my posts easily. i though i posted this already and then could not find it?