Siegen s0984 combination ratchet spanner set 8 piece imperial siegen tools s0984 p this combination ratchet spanner set from siegen has been manufactured using chrome vanadium steel the 72 tooth ratchet ring and gear set requires only 5 deg rotation to pick up next ratchet tooth p p sizes 5 16in 3 8in 7 16in 1 2in 9 16in 5 8in 11 16in 3 4in p siegen s0984 combination ratchet spanner set 8pc imperial