1/2'' impact socket does not fit 1/2'' impact driver

前两天在这里跟风也买了1/2 Chicago Impact wrench, 

也买了

Craftsman Evolv  1/2-Inch Drive, 5-pc. Impact Socket Set, Inch

However the socket does not fit into anvil of the impact wrench.

They both are size 1/2 , what I miss here.

多谢了！

所有跟帖： 

• 握拳攥紧socket，四边对准，用力压。没别的窍门 -满地找牙- ♂ (155 bytes) () 11/29/2012 postreply 19:51:24

• 紧 -BigV8- ♂ (0 bytes) () 11/29/2012 postreply 21:15:46

• 那个四方头 上，有一个弹簧钢圈？用来固定socket 不掉下来， -史迷- ♂ (292 bytes) () 11/30/2012 postreply 07:45:53

• 回复：那个四方头 上，有一个弹簧钢圈？用来固定socket 不掉下来， -甲子- ♀ (29 bytes) () 11/30/2012 postreply 11:47:32