A: Hi John- These bits feature a 3-flat Secure-Grip shank to ensure a solid connection with the drill chuck.
A: All the bits will fit in a 3/8 drill chuck.
A: Hello! We do not offer a multi-piece Step Bit kit for metric. However, we do offer metric step bits individually. You can learn more here > https://www.milwaukeetool.com/Products/Accessories/Metal-Drilling/Step-Drill-Bits/Step-Drill-Bits-Metric
A: Yes with a little oil
A: No, stainless steel is a very hard material, your will need a tougher bit.
A: Hello! Our Black Oxide Step Drill Bit Set (4-Piece) (48-89-9223) does not come with a warranty.
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