acceptable screws
acceptable screws
acceptable screws
No thanks. I will stick to my torx and hex, and they better be in metric.
Penta-lobes for some of the small electronics are funny I guess, but they don't bother me as long as I have a bit for it. Main thing is to understand why some of these different shapes exist.
Torx doesn't come in standard/metric. It uses an arbitrary system. What's so "25" about a T25?
Ah yes, the head size follows their iso standard for it. The threads, however, can be metric or SAE. You can put a different screw/bolt with whatever head in the same hole, but the threads/diameter can be metric or SAE/imperial.