The piston ring with OEM 325905-01 is a genuine DeWalt/Black & Decker spare part specifically engineered for use in several rotary hammers models, such as
DeWalt D25404K, D25405K, D25413K, D25414K, D25415K,D25416K, D25430K, DW570K, DW568K etc
ELU BH35EK, BH32EK etc