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43GENERAL DRILLING HANDBOOK%u00bd%u0009Exchangeable Head Drills vs Solid DrillsOften, the question arises regarding which tool to choose for holemaking: a drill with exchangeable drilling heads or a solid drill, especially when it comes to small diameter holes. The answer to this question is not always the same, and each case should be considered individually. Each type of drill has its own characteristics, advantages, and limitations. However, it is clear that a drill with exchangeable drilling heads can be a viable and competitive alternative to solid drills, as indicated by the following facts.Multiple Geometries On One BodyA wide range of exchangeable drilling heads with different cutting geometries that can be assembled on one tool significantly improves the capabilities of the drill. This includes drilling in various surface types, such as flat surfaces, angular surfaces, convex surfaces, and concave surfaces, as well as whether there is a prehole or not. The availability of multiple exchangeable drilling head geometries allows for machining different hole types with a single tool, whether it be a straight hole, center hole, spot hole, or combined (stepped) hole. This flexibility ensures that a suitable geometry can always be selected to drill the requested hole with one tool.Multiple Grades On One BodyA wide range of grades together with the ability to mount different drill heads on the same tool, as well as their easy and quick change functionality, opens the possibility of drilling holes in various materials with one tool.