Details of YS-615 with Steel Rotor: 1.Applicable for polishing the surface of metal,furniture,alloy,glass fiber reinforced plastics(fiberglass),laptop,cellphone,automobile,plane,plastic,steamer etc; 2.Light weight , Low vibration and ergonomic design for greater comfort and control; 3.Stable,smooth,durable and environmental; 4.Side variable speed control allows users to easily adjust speed for different applications; 5.The decentered dual-action rotation can realize more even & smooth polishing effect; 6.Various sanding pad & paper (Self-adhesive or Velcro type) are availabe as per specific demand. Warm tips: *Add air lube oil to the air sander before&after using. *Rotate the air sander with nothing a few seconds after adding air lube oil. *Cheak before using.Add lube oil to lubricate and clean dust. *If find any part broken or missing,do not use it until it is fixed. *Assembling sanding pad and sandpaper when switch is on is prohibited. *Do not overload the sander and rotate it without sanding pad at high speed and it will be durable.