Stub drills are shorter than twist drills, which gives them several advantages:
Increased rigidity: The shorter length of the stub drill makes it less likely to bend or break, especially when drilling deep holes or hard materials.
Improved stability: The stub drill's stubby design also helps to improve stability when drilling, which can help to produce more accurate holes.
Faster drilling: Because stub drills are more rigid, they can be used to drill holes faster than twist drills.