Free agent DL Dave Tollefson (Giants) agreed Friday to a two-year, $2.5 million contract with the Raiders, ESPN is reporting. He is the sixth key free agent GM Reggie McKenzie has added, joining CBs Ron Bartell (Rams), Shawntae Spencer (49ers) and Pat Lee (Packers), OG Mike Brisiel (Texans) and OLB Philip Wheeler (Colts).