150Pcs/set Micro Drill Bit Set Power Tools Unxuey Mini Precision Hss Power Drill Small Precision Twist Drilling Kit with Plastic Box 0.5mm-3.2mm for PCB Crafts Jewelry Drilling Tool

Good quantity of tiny bits but not accurately sized at all. You can measure each bit and get close to what you need unless it falls in a gap of sizes. For example there is nothing between 1mm and 1.35mm. Disappointing for a set advertised as 0.5 - 2.8mm in 0.1mm steps.

This is a great set to have if you do a lot of crafting makes the tiny stuff so much easier to work with good quality

The drills were not sharpened and some were bent.Some were blue at the cutting end where they had been pushed onto a grinding wheel. My guess is it was an attempt to sharpen them.

This is “OK” quality. It does the job, but was not expecting much for the price anyway. The container is not all that great, so be careful that it locks properly so you do not spill all the bits.

Variation between drill bits in the same size bin is large >0.05mm. And there are missing diameters. For example, 0.9, 1.0, 1.1, 1,2, and 1.3mm bins all measure ~1.02mm. Do not recommend purchase of this kit if you want 0.1mm increments or reasonably accurate diamters.

I build model ships and need to drill several small holes.This set has all the sizes I need.Perfect compliment to all my other ship building tools.

I test anything I purchase, if I can, to verify the quality. It was my profession before I retired and I continue to do so. I need a set of small twist drills that came with a CASE to store them, this product seemed to fit my need. When I received the shipment of 150 pieces of Unxuey Precision Hss drills I tested each drill with my Starrett #3734 precision electronic digital micrometer (yes it is very accurate). I found a number of the drills were not within averages of diameter variance. In other words, the printed diameter on the box did not fall within tolerance (.x5 increases x by one digit, .x4 does not influence x). Some stated diameters were not even in the tray at all. I will keep the set as the BOX is very useful for my storage purposes, but MY kit does not contain the assortment of stated diameters. Anyway, LONG STORY SHORT - You need to check the diameters of the kit you receive if you REQUIRE maximum accuracy.Additional note added 12/2/2019. Upon further study of the drills in the kit I discovered (under microscope) that these drills appear to be hand sharpened which results in totally irregular points. The points are not symmetrical and SOME POINTS ARE FLAT. Yes, the points are flat with no centering whatsoever. Do not purchase this set. I cannot give the kit zero stars but know I rate this kit as ZERO stars.

These are micro drill bits so don't think you're drilling through half inch plate or hardened steel. I bought them to drill brass carb jets. Worked perfect.