I bought this to hold and store a second set of open end wrenches. It holds 5/16 to 1 1/4 inch keys and keeps them secure. It's a little bulky when full, but it still works. I will note that the SK tools are a bit wider and thicker to fit snugly, but most other brands should fit perfectly, I have a handyman. My part set from SK fitted but didn't fit very well and warped the small parts that hold them. Maybe a little heavier so it doesn't flex as much when full and wearing it. At 15 wrenches, this is the largest I've found. I highly recommend it for organizing and storing wrenches laying flat against the wall, for portability I would say a roll would be better. hope this helps you
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