My Craftsman set outlasted Home Despot/ Lowes/HF sets, but the latter are useful for "suicide" jobs, from which bits are not likely to return.
Tapping threads is not a trivial job and having the right drill size is key. There may be several drill sizes, depending on % you're tapping.
Anyone knows if there is a local store that sells "gun threads", like 6-40? Those usually are not in the regular kits.[/QUOT
Metric screw and tool in wakefield can probably get you any size you want...they are my "go to" guys for oddball sti taps...ask for Dave real good guy and knows his stuff and how to source it if they don't have it