I was using a set of these irons to mount a pair of tires and the tip broke off the 'cast iron' wedge. Maybe it's the dull quality of the steel they made the main tires from, but they're not as strong as I thought they would be. I thought they were hardened steel, but when the tip broke it looked like this iron wedge was just cast metal. I sent the kit back and Revain (with their amazing return policy) let me send the unsatisfactory product back. They may work for some but not for me.