This is a genuine DeWalt replacement carbon brush that fits many DeWalt Electric Drills and Impact Wrenches, it is also commonly found in DeWalt Electric Polishers and Grinders. The carbon brush, 450374-12 replaces many brushes including the 450374-99, 450374-00, and 450374-02 replacement brushes made by DeWalt and Black & Decker. This kit includes the carbon brush, wire lead, and spring, the brush is sold individually, and most repairs require replacement of two brushes. Brushes are one of the most commonly replaced parts in Power tools. Worn brushes are common causes of intermittent motor function, reduced electric braking or reduced motor power. Brushes need replacement when the carbon is mostly worn away or if the carbon is badly pitted or broken. Will fit the following DeWalt Tools: DW120K Type 1 « RA Electric Drill. DW130-220 type 2 & 3 « Electric Drill. DW130 Type 1, 2, & 3 Spade Handle Electric Drill. DW140 & DW142 Type 1 & 2 End Handle Electric Drill. DW304, DW305 & DW306 Type 1 & 2 Cutsaw. DW845, DW847, DW 849 Type 1 Electronic Polisher. DW988 & DW880 Type 1, 2 & 3 Grinder. DW290, DW291, DW296 Type 1 & 2 Impact Wrench.