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Gy-Roll twin spindle and multi-spindle heads are specially designed for use with small self-feed drilling units. These self-feed drills are primarily intended for the drilling and tapping of small holes. As it is more often necessary to drill a group of small holes instead of a single hole and since such groups are often on close centres, it is important that a head specially designed for these units be capable of drilling on the closest possible centres. The minimum centre distance for Gy-Roll heads is approximately twice the maximum drill diameter.