These Severe Duty  direct fit replacement parts are virtually unbreakable, ending the frustration of broken mounting blocks due to incidental contact while stacking snow piles or snagging ice patches. These won't leave you hanging at 3am in a snowstorm. Made with Nylon reinforced belt,  WaterJet cut to perfection with severe duty clamping  hardware for pushing rigidity. Absorbs impact protecting the blade and machine, yet wont break when you could otherwise drive away without issue. It's not the machine operators fault that mounting blocks break. Polyurethane blocks are simply not strong enough for what's demanded of them. Make this the last time you replace them. 100% satisfaction guarantee after they are installed.