Old Hitachi 600 watt grinder. worked for 10 years and is still working. I decided to purchase another small one so as not to change different circles. The choice fell on Makita-720 watts. Played quality perforator Makita -24. More than 10 years of work and no problems, only replacement of brushes. I use it in production and at home. I am very pleased with the purchase and the cleanup circle in the kit too.