The triangular arrowhead takes a streamline shape, with barbs for piercing.

箭镞呈三棱流线型，有倒刺，利于穿透。

youdao

Featuring streamline shape and filled with lead, the free-fall opening plug can quickly free-fall to the lower sliding sleeve.

重力塞为流线形，内部装有铅，投塞后快速自由下落至下滑套上并形成密封。

youdao

The inside of the streamline shape head part of the closed type drain tube is provided with the positioning groove of the guide steel needle.

封闭式引流管流线形头部内侧设有导引钢针定位凹槽。

youdao