Uirlis choitianta is ea scriúire a úsáidtear chun scriú a iompú ina áit, de ghnáth le ceann tanaí i gcruth dinge a luíonn isteach i sliotán nó barr i gceann an scriú.
Beijing-Tianjin-Hebei-Lu-Jin and Shaanxi Shaanbei and northern Henan dialects are called "drivers", northern Henan is more called screwdrivers, Jiangxi, Anhui, and Hubei, Henan areas south of the Yellow River, Shaanxi Guanzhong are called "drivers" ", known as "Kai Dao" in the Midwest.
Tá go príomha focal amháin (comhartha lúide) agus cros (comhartha dearfach). Tá scriúirí heicseagán coitianta ann freisin, lena n-áirítear heicseagán istigh agus heicseagán seachtrach.
