... 1. how to mould plastic of preform mould(8cavity) 2. P20 mould plate 3. imported S136 stainless steel core & cavity Descriptionhow to mould ... H13 3Cr13 SKH51 H13, copper 35Crmo, its hardness can up to 38 degree Production precess surface grinder, define super finish, assure ... the surface is to be smooth and straight; precision Boring Machine, CNC machining ...