产品优势 / PRODUCT SUPERIORITY 加粗弹簧，安全紧密；自带限位控制 重物不会脱落；8mm加宽加厚底盘，使用平稳 ；优质密封圈，不漏油。Thickened spring, safe and tight; With limit control weight will not fall off; 8mm widened and thickened chassis, smooth use; High quality sealing ring, no oil leakage. 产品细节 /PRODUCT DETAILS
