If the core is made of glass or mirror, usually with 5mm if the door is made of wood core, is 10MM is the best. Some manufacturers save material costs, using a thin wood (8mm or 6mm) instead. Thin boards, push-pull is frivolous, shaking, poor stability, and after a period of use, very easy to warp, card guides, resulting in push-pull is not smooth, affecting the normal use.