... thickness of hardwood is about 20mm, or iron frame, it’s thickness is about 15mm, some are about 30mm. 3,sponge: ... QC to control our quality, the first QC is about hardware, the second is hardwood and plywood, and ... then package. 7,warrantyThe period of our guarantee is about 1-2 years 8,paymentPayment terms: T/T, 30 ... time: one 40 feet HQ container is about 10-15 days, two 40 feet HQ containers is ...