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Stub drill bits, also known as stubby drills or screw machine drill bits, are shorter in overall length than a jobbers drill bit. Stub drill bits are mainly used for drilling a variety of hole sizes and for making a hole or a larger blunt tip which is used to enlarge a drilled hole. They are often used in automotive and construction industries or in drilling where spindle clearance is limited.Stub drill bits are made from HSS or HSS cobalt steel and are available in different sizes.