About the names of embroidery tools

This is a kind of hand stretching, which is made of thin bamboo pieces into two circles, one of which is slightly smaller so as to be embedded in the other circle and tightly wrapped. The outer ring is equipped with screws, which can be slightly telescopic and convenient for embroidery. The commonly used hand tension is about 20 cm in diameter. There are also bigger or smaller ones.

English Name: As a unique product of China, there is no word in English that this article should be like Pinyin. . . . . .