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
Capable of x69 cuts in 1/2" steel rebar when used with 5.0Ah battery
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
2 x DCB184 5Ah Batteries
1 x Dewalt Charger
1 x DS300 Case