This is the newest variable speed grinder from Metabo.This unit is extra powerful, featuring a 13.5 amp motor. Metabo grinders have an internal dust hub to extend life of the armature. Metabo is the only brand that has a 3 year warranty on their grinders. The warranty is against defects in workmanship and materials, so it basically covers everything but maintenance items (like brushes), and abuse (like a cut cord). The 4.5 Inch Turbo Slayer Granite Blade: this soft bond granite turbo diamond blade is great for cutting slabs fast. If you are cutting granite, cutting marble or cutting other natural or engineered stone this blade is a great value! You will receive 3 blades in this package.