12Pcs Piano Repair Tool Kit Regulating Tools Including Regulating Screwdriver Capstan Screw Wrench Set with 6" Combination Tool Handle for DIY Repair Maintain Piano Tools

I'm extremely pleased with the quality of the individual tools. Skillfully produced. The combo handle is a different story. The inside diameter of the base of the collet is less than the outside diameter of the tool shafts (see pictures). In addition, the threads in the handle were tapped too wide, so the fit of the collet shank is sloppy. It's a perfect storm - If you can even get one of the tools into the collet, it jams and is very difficult to remove. When you try to loosen the collet cap, the whole collet shank turns in the handle instead of relaxing it's grip on the collet. UPDATE: Amazon was great about replacing the tool set quickly. I really wanted to like these tools, but the second set had a similar problem with the handle. The tool shaft diameters range from 5.6mm to almost 6.2mm. The smallest shaft was too small for the handle to tighten down on. Most of the rest of them jammed in the collet and wouldn't release when you loosen the collet cap. I'm returning the second set for a refund this time. I'll leave a two-star rating because the actual tools seem GREAT. But the handle is an important part of nearly all of them. Thanks, Amazon, for making this easy.

Same issues as everyone else. Tools don't fit the handle

Some of the bits dont fit into the handle at all!