can i use this on porcelain tile?

Thank you for your question. The GT700 is not designed for Porcelain. The HDG58 diamond hole saw works well for Porcelain tile, Granite, Limestone, Ceramic Tile, Travertine, Marble and Slate. http://www.amazon.com/Bosch-HDG58-15mm-Diamond-Grit/dp/B003TO5F7W/ref=sr_1_1?s=hi&ie=UTF8&qid=1434401527&sr=1-1&keywords=Bosch+HDG58 If you have further questions please feel free to contact our Bosch Customer Service Representatives at 1-877-BOSCH-99 (1-877-267-2499).

The description reads,'Chuck Size: 3/8 in & 1/2 in'. Does this mean there is no reduced shank and I need a 1/2 drill for the larger bits?

Thank you for your question. All of the bits included in the GT3000 will work in a 3/8" chuck, the shank is small enough that it will work in both a 3/8" or 1/2" drill chuck. If you have further questions please feel free to contact our Bosch Customer Service Representatives at 1-877-BOSCH-99 (1-877-267-2499).

Do these offer any advantages over a diamond hole saw?

Honestly, I have used both and I prefer to use a Diamond-grit hole saw, but if price is a factor and you will be using multiple sizes this can't be beat. I have used Ridgid diamond hole saws and also Milwaukee diamond hole saws and I would recommend the Milwaukee ones. The only issue with these bits is they can "walk" on the material so you have to start slow and I also use water in a squirt bottle

Looking to buy and use one of these to drill a hole in a decorative dish to provide drainage for plants. What size would be recommended?

That depends on how large the dish is and what sort of drainage material you plan to use (aka "crocking" in gardening-speak)t. If it's a large dish, I would definitely use some sort of screen in the bottom (fiberglass window screen works well, cut to fit) and a larger bit, anywhere between 1/4" to 1/2". If it's a smaller dish and you don't intend to use screen in the bottom, I'd use a bit between 3/16" and 3/8", depending on the potting material and what sort of drainage material you use in the bottom of the bottom. Basically, if the holes are too small, they'll clog up, but if they're too large and your crocking isn't sufficient to hold back the soil, you'll lose it very quickly as you water the plant.

ASIN	B00292AAU2
Best Sellers Rank	#9,494 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #17 in Jobber Drill Bits
Brand	Bosch
Cutting Angle String	120 Degrees
Cutting Diameter	0.13 Inches
Date First Available	May 22, 2009
Department	Glass & Tile Drills
Finish Type	Black Oxide
Global Trade Identification Number	00000346372243
Is Discontinued By Manufacturer	No
Item Weight	0.3 ounces
Item model number	GT100
Manufacturer	Bosch
Material	Carbide
Number of Flutes	1
Point Style	Spear Point
Shank Type	3-Flat
Surface Recommendation	Glass, Tile
Tool Flute Type	Spiral
UPC	000346372243
Unit Count	1.0 Count

BoschGT100 1/8inch Carbide Tipped Glass

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