[Precise Fein Tool Compatibility] These carbon brushes are engineered for compatibility with Fein power tools including models WSB 8-115 WSG 9-70 E WSG 9-125 WSB 13-125 and WPO 13-15 IE. [Convenient Auto-Stop Safety Feature] Designed with an auto-stop function that signals when replacement is needed. [Size & Design] The precise 5x10x17mm dimensions guarantee a perfect fit within tool brush holders. The design ensures stable contact pressure and smooth operation under heavy load conditions for reliable performance. [Carbon Material ] Made from carbon compound for conductivity and wear resistance. The material provides consistent power delivery reduces sparking and withstands high-speed motor operation. [ 4-Piece Replacement Set] This value pack includes 4 carbon brushes providing a full set for immediate replacement and future maintenance., Manufacturer: YINETTECH