These 4mm - 12mm step drill bits have a titanium nitrate finish and features sizes from 4mm (approx. 1/8") - 12mm (approx 1/2") and fit a 3/8" drill chuck.
These are excellent for drilling your own guitar foot/effects pedal enclosures and has just about every size you'll need for drilling the various whole sizes for your effects pedal parts.
Common Sizes for Parts
We recommend using a 1/16" drill bit or similar small size bit to pre-drill the holes so your centers will be more accurate. If using with a drill press, this isn't necessary.