The San Francisco 49ers today announced the signing of six undrafted rookie free agents to three-year deals.The 49ers signed safety Corey Griffin from Georgia Tech, cornerback Tarvarus McFadden from Florida State, cornerback Emmanuel Moseley from Tennessee, offensive lineman Najee Toran from UCLA, offensive lineman Coleman Shelton and running back Jeff Wilson.Griffin appeared in 49 games (26 starts) and recorded 168 tackles, eight passes defenses, a fumble recovery and a sack during his five years at Georgia Tech.McFadden appeared in 33 games (26 starts) and recorded 54 tackles, 16 passes defenses and eight interceptions in his three seasons at Florida State.Moseley appeared in 51 games (30 starts) and recorded 142 tackles, 31 passes defensed and two interceptions in his four seasons at Tennessee.Toran played in 31 games (24 starts) in four years at UCLA. In 2017, started all 13 games and earned Honorable Mention All-Pac-12 honors.Shelton played in 53 games (47 starts) in five years at Washington. In 2017, earned First-Team All-Pac-12 and Honorable Mention Academic All-Pac-12 honors.Wilson appeared in 41 games (29 starts) during his four-year career at North Texas. He rushed for 3,205 yards with 32 touchdowns on 562 attempts. He added 70receptions for 527 yards and two touchdowns.