(1B) Steel parts must have polished angles and their visible surfaces smoothed down. Screw heads have to be polished, with their slots and rims chamfered.
所有钢制零件的边缘必须削角、打磨、抛光使其如镜面般光亮。所有螺丝帽的边缘及凹口都要削角抛光，螺丝尾则须做平面或球面抛光。