1, E-computer key 2.Materials:brass,etc 3.Key way:S or E way 4.Finish:NP,NB,SN, ... .(2) Different finish color and sizes available(3) Key way: S-groov key(Normal key) or Computer key(4) Used in bedroom, public areas and ... .532.5S----keyway3703535NB---surface treatment 47537.537.5O----handle5804040 Brass computer key