The Dewalt DCG405 Brushless Angle Grinder has a no load speed of 9000rpm and a 125mm disc diameter. 
 
Features
18V Brushless motor for efficiency, improved application performance and power
Compact gear case for increased access to tight spaces and gives excellent cutting depth
Slide switch provides less user fatigue. Built in no-volt release gives protection against accidental start ups when new battery is installed
Electronic brake has braking time of < 2 seconds when the trigger is released to help reduce accidental contact and injury
Constant Clutch and E-Clutch protects from kickbacks, cuts and wheel bursts
Mesh Covers restricts dust being sucked through the motor
Ergonomic slim body with rubber over-mould for improved comfort and control
Two Position Side Handle offers greater comfort and control
1 or 2 touch guard for quick and easy keyless adjustment
Comes With
1 x DCG405N Angle Grinder
1 x DCB182 4Ah Battery
1 x Dewalt Charger
1 x Dewalt Case