Home / Standards / GB/T 4389-2013 GB/T 4389-2013 Active Double-headed open-ended wrenches,double-headed box wrenches and combination wrenches - Maximum widths of heads 双头呆扳手、双头梅花扳手、两用扳手 头部外形的最大尺寸 Standard Type GBT ICS 25.140.30 CCS J47 Status 现行 Issue Date 2013-11-12 Implementation 2014-05-01 Responsible Dept 中国轻工业联合会 Drafting Unit N/A