0.3-1.6 mm Micro Mini Drill Bit Set Tiny Drill Bits Small Shank Full-Ground HSS Twist Drill High Speed Steel Boards Tiny Drill Bits for Dill (40 Pieces)

Es lo que esperaba, y llego muy rapido

Drill bits work great but, I wish that I hadn't bought so many bits since I only needed one small size. Most of the drill bits that come in this case are extremely tiny and would probably break easily. I don't think that I will ever be using tiny drill bits like these in the future.

quality

I would give these zero stars if I could. These “drill bits” are barely drill bits at all. They appear to be twisted pieces of metal cut from a continuous rod, and I have no confidence that they are actually high-speed steel as advertised. Several of the bits were also visibly bent right out of the package, which makes them unusable even before considering the tip geometry. The biggest issue is that the tips are completely flat instead of being properly ground to a cutting point. I only discovered this after trying to drill a piece of resin. The bit barely left a mark, which immediately seemed wrong. When I inspected the tip, it looked like it had been chopped or sheared off rather than ground to a proper drill point. I checked the rest of the set and found the same issue across the bits: flat tips, signs of shearing, no properly ground cutting angle, and multiple bent bits. For reference, a twist drill should have an actual cutting point, typically ground to a 118° or 135° point angle. These do not. Without that, they do not cut properly, especially at these tiny sizes where precision matters. I rarely advise people not to buy something, but I strongly recommend avoiding this set. These are less than useless; they are basically tiny decorative corkscrews full of disappointment.

Was as described