Tornavida vintni o'rniga burish uchun ishlatiladigan keng tarqalgan asbob bo'lib, odatda vint boshidagi tirqish yoki chuqurchaga sig'adigan ingichka takoz shaklidagi bosh-bo'ladi.
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.
Asosan bitta so'z (minus belgisi) va xoch (ijobiy belgi) mavjud. Bundan tashqari, umumiy olti burchakli tornavidalar mavjud, jumladan, ichki olti burchakli va tashqi olti burchakli.
