It seems a bit odd to need a E-stop on a hand tool. Normally they have a ''dead man'' switch anyway, but I'm not going to question your motives.
If I needed a positive stop on a hand tool I think I would go momentary contact foot switch, step off of it, and the tool stops. There are a number of vendors that sell them, including Harbor Freight for about $14.
As far as E-stop switches go, most are rated for pilot duty only, in other words, low current applications, generally around 6 amps maximum. Not really designed to switch loads, but rather designed to switch relays. For a power tool I would want a switch that was rated at 15 amps or better @ 120V. The highest current rated E-stop switch I was able to find is 10 amp, from China, so I would take that rating with a grain of salt.
An E-stop switch that operates a relay that actually switches the load would be the way to go. That way you could use any E-stop switch.