http://www.lowes.com/lowes/lkn?action=p ... lpage=none
Unfortunately Lowe's only lists the expensive ones at the website..You can get cheap Black & Decker sets that stack and have several(4?) sizes for $5-7 or so.You get one universal three part arbor(spur bit,base,and lockdown nut)and 4 different size hole saws(1" to 2-1/8"(?)2-1/8" is standard size for doorknobs,1-1/2" for deadbolt holes so both are probably included).You can probably spin them backwards in a drill for a smoother hole.Take it slow and try not to overheat the metal for a better cut.
The Bimetal ones are better for cutting aluminum but more expensive also.If you only need one size,you may need to buy a seperate arbor(center mount portion)..then add more sizes as you need/want them.I'm in construction so have them up to about 4-1/2" that fit a standard Milwaukee arbor for things like vent pipes and dryer vents.I've used them in sizes to about 8" for installing can lights in acoustical ceiling panels.
I do have the cheap sets also for the smaller sizes for use in the drill press.I filled in the voids they usually sell by 1/8" sizes with some certain ones that I seem to drill a lot for lenses.You can get them by 1/16" variables so picked up some like 1-3/16" and 1-5/16,which I seem to use a lot for lens mount rings.
Forstner bits I have in 1/8s from about 3/8 to 2"(Most are used in fine woodworking)..2-1/8(doorknob hole jig),larger ABS plumbing Selfeed bits(2-1/4" and 3-5/8").
If anybody is interested..I do have a nice set of those two last bits for sale..Milwaukee Selfeed 3-5/8"(for 3" abs pipe..in the box with an extra spur bit,used for one house..reg about $100),a 2-1/4" M. SF.(for 2" abs..more use than the other but okay),and an extension that fits both...for $60..I don't need two sets anymore!I'll see if I have an extra
bit for the 1-1/2" abs and throw that in the deal.Google Milwaukee Selfeed bits for retail prices..if you need them,that's a bargain!
BA..planning on building any BIG
Gotta go to work!
The views and opinions expressed by this person are his own and not the general consensus of others on this website.Realityguy