how to make stainless steel double wall thermos flask ？

Sun Glory Group is the No.1 kitchenware and drink ware spot to spot solution maker in Aisa，has 53 stuffs in Guangzhou headquarter，more than 600 stuffs in factory，including R&D team with 70 engineers and service team of 50 engineers（9 of them specially for overseas market customers 16H*7D） In the passed 6 years, we have set up more than 36 stainless steel bottle and thermos flask production lines for customers in India,Turkey,Spain,Mexico,Bengal etc. Welcome to contact Derek Sunglory for more details,we will do our best to serve you. Derek SunGlory Whatsapp： 86 138 2224 0712 Email ：sunglory15@