,Side positioned spindle lock gives greater protection to button when using in confined spaces Soft start reduces movement of the tool on startup increasing user control No-volt release switch prevents the unit from starting unitentionally when locked on. Switch must be consciously reset before power is delivered The compact gear case allows access in confined areas Pop off brushes protect the armature from damage at the end of brush life resulting in greater motor durability Dust ejection system removes majority of debris from the air which passes over the motor, preventing abrasion and tracking Fully leaded stator windings for increased motor durability New guard design allows guard fitment, adjustment or removal without the use of tools, for increased flexibility Abrasion protected field for increased durability Anti lock flange prevents flanges from permanently locking up and locking the disc on High effeciency motor design improves performance in demanding applications Small girth allow comfortable gripping resulting in superior ergonomics,DeWALT DWE4217-QS angle grinder 12.5 cm 11000 RPM 1200 W 1.85 kg.