Depending on your job requirements, 17mm 6point for Isuzu, 5/16 6point and 5/16 Allen for gm, inverted torx on sprinter vans, 21 mm and 22 for New flange style semi drive lines . Some old 1tons had Torx . 7/16 6 point gm 1 tons. Yes I remove a lot of drivelines. I drive a row truck for a...