Lub stud ntsia liaj qhov rooj yog ib qho xov kab ntawv nrog 2 hnyav hexagon txiv ntoo, thaum lub hex bolt muaj lub taub hau nrog ib lub taub hau nrog ib lub txiv ntoo. Ceev thiab taub hau yog ob qho tib si rau ib sab. Bolts xov yog txhais nyob rau hauv ASME B1.1 Unified Inch Ntsia Hlau Xov, (UN thiab cov xov xov tsis tau). Cov xov feem ntau tshaj plaws yog daim foos uas yog ib qho V-profile. Cov ces kaum sab xis yog 60¡Ã. Daim foos no tau siv dav hauv cov xov Unified (UN, UNRS, UNC, UNRF) daim ntawv ua ISO \ / Metric Xov.