When picking up a pair of scissors, I do care if they're designed for right or left handed. And the handle, of the scissors or screwdriver, is it comfortable and durable? Screwdriver makers have long known not to make the handle of smooth metal. Is the screwdriver magnetic? Does it have swappable heads? Are the swappable heads reversible plug in and out, are they themselves reversible, giving me two cross and two straight heads in one robust non conducting, rubberised, shock absorbing screwdriver package? If mgnetic, how magnetic?