The lug boss is arranged between the screw head and the screw rod, and the external circumference of the lug boss is provided with a plurality of longitudinal grooves.
该凸台是设置在该螺头与该螺杆之间，其外周缘设有若干纵槽。
2
Wherein the screw comprises a screw head, a lug boss and a screw rod.
该螺丝包括一螺头、一凸台及一螺杆。
3
The Manual Cappers are portable, hand-held, cap tightenersthat can be used to tighten or to remove screw and lug typecaps.