... mainly used for PVC, acrylic, double color boards, engineering plastic, bakelite, etc. Nonmetal materials on the solid wood engraving and ... model mold, can not exceed limit specifications in the plastic box, aluminum chassis, panel open KongXi hole. Of course ... 1mm, double copper nut spring away to poor, engineering plastic flexible couplings4 guide: adopt 10mm diameter chrome-plating of strength5 ...