Being a three-lipped tool, it is used for expanding holes (preparation) for reaming. From Wordnik.com. [6. Centring, drilling and counterboring or countersinking] Reference
Internal side-cutting tool (boring tool) or spiral-fluted counterbore (three-lipped twist drill) to produce the hole with machining allowance for reaming. From Wordnik.com. [3. Preparation for reaming] Reference
three-lipped twist drill (spiral countersink) - head counterbore or counterboring tool with pilot. From Wordnik.com. [1. Objectives and contents of practical vocational training in the working techniques of Drilling, Countersinking and Counterboring] Reference
(3) three-lipped twist drill - for enlarging holes by minor dimensions. From Wordnik.com. [1. Objectives and contents of practical vocational training in the working techniques of Drilling, Countersinking and Counterboring] Reference
Fore-toothed, three-lipped mouth. From Wordnik.com. [The poetical works of George MacDonald in two volumes — Volume 2] Reference
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