Mandrel and Stubby Bits
Mandrel in this kit is the 1'x8tpi and comes with two drill bits for hard and soft wood. This size fits most lathes such as the Jet, Rikon, Delta, Harbor Freight, and others benchtop and midi in this size range.
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