(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.
所有鋼制零件的邊緣必須削角、打磨、拋光使其如鏡面般光亮。所有螺絲帽的邊緣及凹口都要削角拋光，螺絲尾則須做平面或球面拋光。