Ryobi P423 18V One+ Brushless 4-1/2" 10,400 RPM Grinder and Metal Cutter w/ Adjustable 3-Position Side Handle and Onboard Spanner Wrench (Battery Not Included, Power Tool Only) - Amazon.com
Ryobi One+18V 4-1/2" Angle Grinder - Amazon.com
Ryobi P421 6500 RPM 4 1/2 Inch 18-Volt One+ Lithium Ion-Powered Angle Grinder (Battery Not Included, Power Tool Only) - Newegg.com