Doesit have a pilot? What type of pilot do you need for glass?

If you make a hole the aize you are trying to make in a small plank of wood first, tou can then clamp the wood plank to the glass or ceramic you intend to cut a hole into and the wood plank will act as a guide/stabiliser. This is how I have always made precise, no wobble cuts when challenged with using a hole saw without a pilot bit in the center. Although, I do have many piloted wood hole saws that I can use to create the guide plank, so that helps. Hopefully this makes sense amd you understand the method I have explained.

Is there an available guide for this tool?

Not that I know of, I found cutting thru brick I had to take it slow. I just tipped the cutting tool slightly till I had started a slight half circle then was able to hold to start the full circle. I was very surprised that it did a nice job cutting thru the brick half at a time

How long do they last? Or how often can you use them

I bought the set for two particular diameters that I needed. I have used those to drill holes several times and they worked well. They are ideal for someone like me who needs to make several holes in tiles while renovating a bathroom. I don’t believe that they were ever intended for professional use or any use where they would be drilling many holes per day on a regular basis.

Can this cut through a mirror?

Yes, this drill bit can cut through a mirror

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3 otters 15Piece Diamond Hole Saw Kit, (6mm-50mm / 1/4"-2") Glass & Tile Drill Bits, Ideal for Glass, Bottles, Pots, Marble, Granite Stone

3 otters 15Piece Diamond Hole Saw Kit, (6mm-50mm / 1/4"-2") Glass & Tile Drill Bits, Ideal for Glass, Bottles, Pots, Marble, Granite Stone

Product ID: 86299136

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Details

Material
Carbon Steel
Cutting Diameter
5E+1
Finish Type
Nickel
Shank Type
Straight
Brand
3 otters

💎15 precision diamond-tipped sizes

💧Cooling water slots for debris-free drilling

🛠️Universal electric drill compatibility

Description

💎 Drill Like a Pro, Shine Like a Diamond!

TOOL FRIENDLY - Compatible with most electric drills and easy debris removal with included mini screwdriver.
EFFORTLESS PRECISION - Diamond-coated tips ensure smooth, clean cuts with zero rough edges.
SMART COOLING DESIGN - Side slots optimize water flow and debris ejection for uninterrupted drilling.
VERSATILE SIZE RANGE - 15 diamond-tipped bits from 6mm to 50mm cover every project need.
MULTI MATERIAL MASTERY - Perfect for glass, tile, marble, granite, porcelain, and more—one kit, endless possibilities.

The 3 otters 15Piece Diamond Hole Saw Kit offers 15 precision diamond-coated drill bits ranging from 6mm to 50mm, designed for smooth, clean holes in glass, tile, marble, granite, and other hard materials. Featuring smart side slots for cooling and debris removal, this versatile set is compatible with most electric drills, making it the ultimate tool accessory for professionals and DIY enthusiasts alike.

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