Aiskaer 60 Pcs Premium Diamond Drill Bit Cylindrical Burr Kit Jewelry Beach Sea Glass Shells Gemstones Lapidary.1mm 20pcs.2mm 20pcs.3mm 20pcs

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.

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

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.

Good value