and fit deep into the screw head for a good grip. These had a flat tip

The basic tool is OK. What's not described in your advertisement is the tips. Hex wrenches usually have a rounded tip so they can be used at an angle. and fit deep into the screw head for a good grip. These had a flat tip, which would not grip the screw sufficient to turn. Also, the dimensions listed is the diameter of the shaft and not the dimension of the screw with which it is to be used. I was looking for Tee wrenches that worked with 2mm to 8mm screws. CLR

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