Tus yuam sij hex, tseem hu ua Allen ciaj ntswj lossis Allen qhov tseem ceeb, yog cov cuab yeej siv tes ua ntau yam siv los zawm lossis xoob cov ntsia hlau thiab bolts nrog hexagonal sockets.Raws li lub chaw tsim khoom lag luam muaj npe nrov nrog 30 xyoo dhau los, peb muaj kev txaus siab rau kev muab cov yuam sij hex zoo uas ua tau raws li qhov xav tau ntawm peb cov neeg siv khoom.