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What is the best bit for putting a 3" dia. hole thru the stucco exterior wall of my home?
Will the 6755 work?

This drill bit is not recommended for drilling through stucco. It is designed for porcelain tile.

Does this come with all the bits or do you just pay for one?

These porcelain bits are all sold individually.

I need to cut glass discs from 1/16" thick borosilicate plate glass. Can these cutters do the job, without significant chipping of the outside edge of the disk, and without excessive wear?

These diamond drill bits are designed for ceramic, porcelain and glass tile. 1/16" material is very thin and may crack entirely due to the stress of cutting. If you are able to get a successful cut, you will still need to knock the disc out of the hole saw, which may likely result in chipping the edge or fracturing the disc.

For the larger diameters do you need to purchase a pilot bit?

At the larger sizes you can use a pilot bit to start the hole, but it is not needed to be used with these bits.

If there is no pilot bit in the center of the hole saw, how do you cut a hole in a specific place, like a drain?

Pilots in diamond drill bits have become less common due to them wearing before the bit does, the extended length of time cutting hard materials, and do not allow use of center water-feed equipment.

To begin drilling into porcelain, start on an angle and begin the hole. Once you have started the hole, adjust the drill bit so it goes straight and creates a flush hole. You can use a template to cut holes in specific areas.

For drilling on granite, what bit do you recommend?

For drilling granite, we recommend using a diamond core bit.

What is the best drill bit for porcelain tile?

We recommend the DiamondSure wet drill bits for drilling through porcelain tile.