These drill bits do not have coolant holes. If coolant is required for drilling, it must be fed from the machine to the bits' tip using a separate hose. Carbide drill bits provide excellent hardness, wear resistance, and heat resistance. They are harder than high-speed steel, cobalt, or powdered-metal drill bits and require a rigid setup such as a fixed-spindle machine. The bits create precise holes with a smooth finish and often eliminate the need for reaming the hole after drilling. Jobber-length drill bits provide a good balance of strength and accuracy when drilling into a variety of materials.