It has an anti-restart function which provides extra safety as well incase there has been a power shortage. The X-LOCK mechanism makes childs play of removing and attaching a wheel. The battery protection circuit provides enough safety to ensure a long and healthy tool life. Designed with an ergonomic soft grip, reducing user fatigue and increase user comfort. This is a body only, naked machine, it is not supplied with batteries or a charger.Automatic Torque Drive Technology ADT, this automatically changes the cutting speed according to load condition. New Tool-less wheel cover for fast and easy adjustment. Bore Diameter - 22.23mm. Max Wheel Thickness - 6mm.