勾扳手又称月牙形扳手，俗称勾扳子，用于拧转厚度受限制的扁螺母等；于拆装车辆，机械设备上的圆螺母，卡槽分为长方形卡槽和圆形卡槽。制作工艺：使用 合金钢经高温锻打而成，，.适用圆螺母的外径范围:S:22~26S:28~32S:34~36S:38~42S:45~52S:55~62S:68~72S:78~85S:90~95S:100~110S:115~130S:135~145S:150~160S:165~170S:180~200S:200~220S:240~260S:260~280S:280~300S:300~320S:320~350S:360~380S:380~400S:400~420。
