... baked under 150 degree centigre which greatly improves the anti-corrosion and anti-collision performances. It is oil free and can be ... devices, oblique tongue insurance and the anti-tongue-sawing device, which ensures anti-stubbs, anti-sawing, anti-fangqiao. After pushing the insurance ... of more than 100,000times. There is shock-absorber, anti-loose and wear-resistant plastic mat, which reduces noise ...