DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Specific peripheric component of RNA polymerase III which synthesizes small RNAs, such as 5S rRNA and tRNA. Component of the RNA polymerase III (Pol III) complex consisting of 17 subunits. Rpc25/rpc8 and rpc17/rpc9 form a Pol III subcomplex. Belongs to the eukaryotic RPB7/RPC8 RNA polymerase subunit family.