... the metal joint 3. Lightweight,self-contained in aluminum case with black power coat finish 4. Aluminum casing provides rugged ... bead,glass fibre,soft metal.etc 9. Use the air-press sustain framwork 10. Built-in Handle for easy carrying, ... 8,Visual angle>30,fire resistance accord with international standardSoft metal:brightness>3.0,Visual angle>30,fire resistance accord with international standard ...