The RIDGID "EML" (Extended Motor Life) series features a scientifically designed and engineered motor, manufactured to the tightest tolerances imaginable, to keep working even in the most abrasive conditions. This motor features:

These built in protections make this motor last up to 5 times longer than other motors, even in the most abusive conditions.
The following tools are part of the EML™ family:

R1000
4-1/2" Angle Grinder
R5010
Heavy-Duty 1/2" VSR
Hammer/Pulse Drill
R7100
Heavy-Duty 1/2"
2-Speed VSR Drill