8 characters Gear: Innovated symmetrical arrayed high speed synchoronous gears, made from international standard gear wheel. Chain: High strong chain and high precision welding technology, meet ISO 3077-1984 international standard: Hook: Made of high class alloy steel, it has high strength and high security Limit Switch Components: Main components are all made of high-class alloy steel, with high precision and security. Framework: Slight design and more beautiful, with less weight and smaller work area. Plastic Plating: By adopting advanced plastic plating technology inside and outside, it looks like a new one after years of operation. Enclosure: Made of high-classed steel, more firmly and dexterous.