60 Pcs Diamond Drill Bits, 1mm 2mm 3mm Mix Set Jewelry Drill Bits for Jewelry, Sea Glass Shells, Gem Stones Lapidary, Jewelry Making

Like everyone else, bought these because of the low price. Did not expect much in the way of durability, so I was not surprised when two of the bits (2mm) were rendered useless after 2 or 3 holes in shale (from a core sample). But then, a third bit is still cutting after 20 holes in shale plus three holes in amethyst! So I put in a 3mm bit and cut three more holes in amethyst- and that bit is still going strong.I suspect quality control for these is non-existent at this price, but even if I have to chuck 1 in 3, this is still a better buy than the "name brand" products. I've got 60 bits to work thru, but I'll be back for these when I need to reload.BTW- using a Dremmel knockoff (Craftsman) at ~2000rpm by hand. Haven't snapped a bit yet. I would have given this set 3 or 4 stars, but because of the low price... 5 stars.

Great product worked great

Bought these for my kids to drill holes in stones for jewelry. Had maybe 1 in 3 that just crap out on the first drilling but for how many you get it isn't an issue. The ones that didnt bite the dust lasted multiple drillings and worked great. would definitely recommend these.

This was the size I needed, so works for me. The quality seems to be good. They are holding up ! I did not realize that I’d get 2 packages of them . Bonus!!!

I read every review I could find on Amazon and felt that these Diamond bits were the best available. Upon using to drill sea glass, the 2 and 3 mm bits work well, but the 1 mm bits failed miserably. Upon inspection with a 10 x magnifying glass, I noted very few diamond crystals on the tip of the 1mm bit. It was taking 5-10 minutes to drill through a 5 mm piece of glass. I broke at least one bit and shattered 2 pieces of sea glass. Eventually I gave up. I did some more searching online and found Lasco which cost significantly more. in desperation I purchased ten 1.5 mm bits for about $20. Well worth the money. I was able to drill my entire collection of sea glass and ceramics with ease, about 20 seconds per piece. The bit lasted for 26 pieces. Could probably drill a few more, but upon inspection about 75% of the diamond crystals were now gone. I used a micro mill on the lowest setting and drilled under water. I would recommend any serious hobbyist use a better product. Lasco worked well for me. https://www.amazon.com/dp/B00285XY0S?psc=1&ref=ppx_yo2ov_dt_b_product_details

Product was as discribed. I am very happy with this product.

I bought these bits to drill holes in a number of porcelain tiles. The bits are very inexpensive so I didn't fear breaking a few in the process, but none did. The bits are pretty true but a few wobbled in the drill. Not worried with a box full to choose from. I only used one bit to drill all my holes with smooth hole sides and easy penetration through the porcelain surface. I have so many bits left that i will be giving some away to anyone who asks because of how well they worked and how many you get.

So far I've broke more shelves than drilled through so I don't know I'm wet drilling they just are not what I was expecting at all

Received timely, intact and well packaged. I am extremely satisfied with theses bits. Love them, actually!These bits are well made and tough. I drill Sea Glass with them, many pieces double-drilled. I've managed to do 53 pieces before I need to change one out. Wonderful!Many thanks, will most definitely purchase again :)

great service good product

Good value

good bits i use regular. 1mm size is more like 1.25 to 1.5. but other than that good.

ok