Tools?

What tool will i need to cut 6" holes in wood?

jig saw or hole saw bits and a drill.

I can't find any drill that will fit a
6" hole saw bit.

need to find a different shank, most the saw parts are interchangeable

or a saw zaw, those are the most useful saw in my eyes

Would this hole saw

Amazon.com: Malco HSW97 Vent Saw - 6 1/4-Inch for Cutting Wood and Siding: Home Improvement

fit this drill?

DeWalt DW222 Heavy-Duty 3/8" (10mm) VSR Drill (0-1,200 rpm)

i didnt see the shank size of the 6 1/4, but as you can see the dewalt has a 3/8" shank

look for something like this
Amazon.com: DeWalt DW304PK Heavy-Duty 10 Amp Reciprocating Saw: Home Improvement

or get a little kit like this
Amazon.com: DeWalt DW304PK Heavy-Duty 10 Amp Reciprocating Saw: Home Improvement

Harbor Freight Tools has them...

Harbor Freight Tools - Quality Tools at the Lowest Prices

Good luck

So a reciprocating saw can cut 6" diameters in wood?

yeah if you can follow a line, but a hole saw will be the easiest
and sorry for the 2 same links i meant a kit like this
Amazon.com: Ryobi 5 Pc. 18V Combo Kit - Factory Reconditioned: Home Improvement
depending on line of work, you really dont need a dewalt, ryobi is a good cheaper brand in my eyes

Just go to Lowes or Home Cheapo and ask one of the sales weasles what they got that will cut a 6 inch hole in whatever material your cutting.....or does that make too much sense???