Sealey 16 piece metric combination ratchet spanner set sealey premier ak63912 the sealey combination ratchet spanner set 16 piece metric is a high quality set of slim style chrome vanadium steel spanners hardened tempered and mirror finished for corrosion resistance 72 tooth walldrive ratchet ring giving ultra smooth ratchet action requiring only 5 rotation to pick up the next tooth available as sixteen piece set supplied with one bit holder and three square drive adaptors sealey ak639