Drill bit questions
Hi, I have several questions re: drill bits.
(1) Which of the following step bits is better? Can both of them drill holes for example inside a wood door, or rather just on thinner plastic & metal?
(2) is there an affordable, easy to use, sanding drill-bit, to which sand paper can easily be attached? I tried YouTube but no dice. I have a rubber sanding bar, but it's hard to get the sandpaper on it, and it's hard for me to sand manually.
(3) I recently bought what turned out to be a junky set of tools in a red/yellow/blue kit consisting of various screwdrivers & driver bits. But the metal thingie which is supposed to grip those bits magnetically, turns out to be barely magnetized, such that the skinnier bits don't stay put, rather fall out.
Question: What is that thingie called, and where's a good place online to find same? (or locally? Home Depot? Walmart?)
Must it be part of a set, or can it be bought singly?
P.S. Some background: I'm a mid-aged female & quite a newb at this. It's not as if i enjoy mens' work, but i've learned that if i don't help myself, it's hard to get anyone to help me, and even if they do, it's usually a botch job. Ditto re: handymen around here, they're spread so thin.