need a hole for a 1" bulk head in my sump

[Delphinus]

You can also get them from mops.ca, something like $15-20 last time I checked there.

BTW, you're correct in that you need a 1-3/4" hole for a 1" bulkhead. (One caveat: not if you're using schedule-80 bulkheads as they have a thicker wall thickness. But the "regular" bulkheads we normally use are schedule-40.)

[KrazyKuch]

I bought my diamond bits from totem...you can get a whole set from 1/4" to 2.5" I believe and they come in a nice case for $90