Keep in mind that these are printed circuit type and the contacts are usually rated for resistive load, if you intend switching even a dremel, especially switching at full rpm setting, these contacts may not last long, I would go with something a bit heavier rating and terminal type rather than PC type. If you want to get really fancy pick up a surplus solid state type with 5v input and 110vac load. Probabally last you for ever.
Al
BTW if you do use a coil type relay, don't forget the reverse emf diode across the coil. (typically a 1N4007).