100pcs m2 m2.5 m3 m3.5 m4 m5 m6 m7 m8 m10 m12 insulation plain gasket ring red steel paper fiber insulating flat washer customization availa

red steel cardboard is made of pure natural materials, made of wood pulp and cotton pulp, the main material is cotton fiber, because the fiber can be disposed of by burning, it will not cause environmental pollution has good insulation, arc resistance, oil resistance, easy processing (stamping and bending) strength, light weight, excellent mechanical strength and heat resistance, and the advantages of metal, plastic, rubber, leather and wood prevents the unit from vibrating or sealing the screws.syi