Viking 4.5"/5" Angle GrinderIndustrial duty angle grinder Heavy duty cast construction Speed regulating valve maintains constant speed control and helps prevent over speeding Vibration dampening side assist handle for left or right hand operation Lock off safety lever Controlled variable throttle lever permits feather edging to full speed grinding Cylinder is made of alloy steel, heat treated to HRC 58 60, surface ground for long life and maximum power Internal gears are made of