1.Universally phim lub tsev kho mob txaj.
2. Smooth nto.
3.Ua los ntawm high-strength engineering yas cov ntaub ntawv uas yog check thiab muaj zog.
4. Tes crank yuav muab tais
3.Self-Protecive muaj nuj nqi thaum screws txav mus rau saum.
4.Kev txhawb nqa yog ua kom muaj zog hlau alloy khoom, strudy thiab burable.