The internal device adopts a fully sealed design, which greatly improves the waterproof performance compared to similar products; no external power system is needed, and construction is convenient and fast; manual key lifting locks the barricade to rise, and the landing time is short, safe and reliable (with reflective film and no light belt )1.The center column is made of 219 * 6MM304 stainless steel wire drawing2. Specifications: diameter 400 * height 850MM, lifting height within 600MM