... Service Description:1.C type glass cover with big center hole 2.Materil: float glass3.Rim: ... Toughened ) glass lids (glass cover) in China, with capacity of up to 7 million pcs per month. ... and also establish long term and good relationship with some big brand cookware enterprise such as Supor, ect. ... rim.5.Destructive testing: break the lid with hammer and check,the number of particles should ...