Cov tshuab ntxhua khaub ncaws yog cov khoom siv tseem ceeb siv hauv ntau qhov kev lag luam thiab kev siv los faib cov khoom thauj, tiv thaiv kom tsis txhob xoob, thiab muab qhov chaw du rau fasteners. Nrog rau ntau tshaj 30 xyoo ntawm kev paub, peb muaj kev txaus siab los ua ib lub chaw tsim khoom ntawm cov tshuab ntxhua khaub ncaws zoo.