6mm Bit to 4mm Bit-Adapter

thingiverse

Converting a 4mm bit to a 6mm bit requires some basic knowledge of drill bits and their uses. First, determine if the 4mm bit is a split-point or a solid shank type. If it's a split-point, you can easily convert it by using a bit sleeve adapter. Simply place the 4mm bit into the sleeve and thread the sleeve onto your power tool. The sleeve will expand to fit the 6mm shaft, allowing you to use the 4mm bit as a 6mm bit.