STUB DRILL BITS
There are 4 stub drill bit sizes:
The 5/16″ and 11/32″ stub drill bits have a 1 3/4″ flute length and the total length is 3 1/16″. The standard wood bit is longer and tends to “wander” if it hits a tight wood grain. The 5/16″ is the most common drill size for threading a 3/8″ x 16tpi hole. The 11/32″ makes it easier for threading resin, acrylic and dense hardwood. *Tip: if you’re using spalted or very soft wood, either stabilize the threads with glue or use the threaded inserts.
The 29/64″ and 7/16″ stub bit is used for the Threaded Inserts Some wood or especially acrylic and resins do not hold threads well and the inserts (either brass or stainless steel) make it a lot easier.
These drill bits are made in America