直管大头内径32mm，小头外径30.5-31mm。

直管伸缩工作长度80cm，收起长度约45cm。【主要功能】：起到延伸工作长度作用。

 Straight tube diameter 32mm, small head diameter 30.5-31mm.

Straight tube telescopic working length 80cm, stowed length of about 45cm. 【Main function】: play the role of extended length of work.