Great value bits that work as they should. Not sure about durability yet but they also work from the first time I use them up to around 10 hours of use.
Pros
Different sizes to choose from: Our tap measures approx. The shank and bit diameter is 3 x 3 mm, 3 x 4 mm, 3 x 5 mm, 3 x 6 mm, 3 x 7 mm, 3 x 8 mm, the length of the cutter is about 1.5inch/39mm and the diameter of the handle is about 3mm; Please allow slight errors in size due to manual measurement