本实用新型的伸缩式黑板刷可以自由调节刷体的高度，对于小学生在擦位于黑板较高部分的粉笔字时十分方便有效。
The height of the brush body can be free to be adjusted, thereby being convenient for pupils to brush the words on the higher part of the blackboard.
主杆上的两个挂钩也可以随意自由调节高度，方便各种挂衣要求；
The height of two hooks on main pole can be flexibly adjusted for different hanging requirements.
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