This Standard specifies requirements for leaded brass strip over 0.006 in. up to and including 0.252 in. thick and up to and including 6 in. wide for use in the manufacture of clock, watch and other instrument components, as follows: - CZ120 - Leaded brass strip (59 per cent copper 2 per cent lead); CZ119 - Leaded brass strip (62 per cent copper 2 per cent lead); CZ 118 - Leaded brass strip (64 per cent copper 1 per cent lead) each in the following four grades with respect to tolerances. Grade A1 (superfine); Grade A (fine); Grade B; & Grade C.