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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💎 Cut through the toughest with precision and style!

PRO TIP FOR LONGEVITY - Keep water flowing during use to reduce heat and extend bit life—work smarter, not harder.
MULTI MATERIAL MASTERY - Perfectly engineered for glass, tile, marble, granite, bottles, pots, and more—your all-in-one drilling solution.
VERSATILE 15 PIECE SET - From delicate glass to tough granite, cover every project with precision sizes from 6mm to 50mm.
DIAMOND TIPPED EXCELLENCE - Experience unmatched cutting strength and longevity with premium diamond drill bits designed for hard surfaces.
SMOOTH ACCURATE DRILLING - Each hole saw features a thickened top edge and smooth surface treatment for flawless, chip-free cuts every time.

The 3 Otters 15-Piece Diamond Hole Saw Kit offers a comprehensive range of 6mm to 50mm diamond-tipped drill bits, engineered for smooth, accurate holes in glass, tile, marble, granite, and other hard surfaces. Featuring a thickened cutting edge for enhanced durability and a titanium finish, this industrial-grade kit is ideal for professionals and DIY enthusiasts seeking reliable, versatile drilling performance.

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€ 58.61

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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Perfect platform for hard-to-find items. Delivery was prompt.

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Manufacturer	JOHOUSE
Part number	JOHO167
Item Weight	100 g
Product Dimensions	5.08 x 5.08 x 5.08 cm; 100 g
Item model number	JOHO167
Size	15PCS
Colour	Silver white
Style	Industrial
Finish	Titanium
Material	Marble,Glass,Stone
Item Package Quantity	1
Number of Pieces	15
Batteries included?	No
Batteries Required?	No

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

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