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19GENERAL DRILLING HANDBOOK Design ConfigurationDrills may differ in their design configuration as follows:%u2022 Solid Drill - Primarily used for drilling holes up to 12 mm (0.472 inches) in diameter and up to 12D in depth (drill depth = 12 x drill diameter).%u2022 Drill With Indexable Inserts - Mainly used for drilling holes with a diameter of 12 mm and larger, this drill design is also successfully used for deep drilling.%u2022 Drill With Exchangeable Heads - An alternative to drills with indexable inserts, used for precise drilling in finish operations.ISCAR is currently the only company in the world that produces drills with exchangeable heads starting from a 4 mm diameter.SOLID-DRILL Drill with Indexable Inserts Drill with Exchangeable Heads