super tough and thicker than a standard bolt cutter opens. its very heavy but I only use it when im going to be a decent distance or time away from the bike. im giving it 4 stars because a lock this long thick and heavy should have a designated carrying bracket for the bike. its to stiff to wrap around something snug enough that its not bouncing or banging on the frame. I have to use a rack bag to carry it. the onguard mount on the market is only for the U locks. if they offered a Rottweiler lock mount I would be the first in line.