I hf grinders and cut off wheels all the time. The grinders are cheap as most of the stuff at hf, but for 20 bucks or less if they go bad I just fork out an other 20bucks. I have some problems with thiere cut off wheels but most of the time its my falt, cann't put to much presure on the blade, you have to let the clade do the work. If you use a thin blade on hard steel and to much presure will cause the blade to brake up. Use caution when using any power tools.