Rated input power 300W,120V~60HZ Maximum speed 2500RPM Lightweight and maneuverable All ball bearing construction Metal gear housing Contoured Neck grip provides a secondary hand position for increased maneuverability Product contains 1/4"collet and 1/8"collet ,it can be replaced as required by the user. User need to take 1/8"collet out when they use 1/4"collet Product includes:5pc grinding stone 2 wrenches 2 carbon brushes 1/4"collets and 1/8"collets Powder coated field protects the motor from dust and debris for longer tool life Rated input power 300W,120V~60HZ Maximum speed 2500RPM Lightweight and maneuverable All ball bearing construction Metal gear housing Contoured Neck grip provides a secondary hand position for increased maneuverability Product contains 1/4"collet and 1/8"collet ,it can be replaced as required by the user. User need to take 1/8"collet out when they use 1/4"collet Product includes:5pc grinding stone 2 wrenches 2 carbon brushes 1/4"collets and 1/8"collets Powder coated field protects the motor from dust and debris for longer tool life Notice: 1/8"collet and 1/4"collet are all assembled in products, if you use 1/4"collet,you have to take 1/8"collet out first.