I tried lehigh and in a pinch the local hardware store. The Lehigh are about the same quality, and 1/3 the price as the local $6 ones (flaps) at teh hardware store. Since then I've been getting them on the gas truck when they bring all my wire/gas/hard goods etc. They have been bringing CGW camel grinding wheels flaps with 3x the sanding material, last 4x as long as local or Lehigh stuff, and they're $6 ea. They also have the nut made on the back of the wheel, no spanners and you can flat grind with them and no threads or spanner nut hitting the piece. Come in a box of 10. Cut offs, get a metabo 6" cutoff machine and put good 6" wheels on it and rock out. Lasts 10x longer than a 4" on a grinder, plus you don't die from exploding stuff