Mandrel and Stubby Bits
Mandrel in this kit is the M33xM30 to fit oneway lathes and comes with two drill bits for hard and soft wood.
Drill bits are (5/16&21/64)
5/16 bit is for soft woods as a smaller tighter hole makes for better threading of soft woods.
21/64 bit is for hard woods as the tight grain make threading slightly easier with larger hole