Metabo - The letters and number of these model - they all have a meaning. The more letters the more features! Let's Break it down: W - Winkelschleifer (German for Angle Grinder)
Metabo 613059520 WPB 18 LT BL 11-125 Quick 18V Brushless LiHD 4-1/2 in. / 5 in. Cordless Brake Angle Grinder Kit with 2 Batteries (5.5 Ah) - Walmart.com