Diamond Core Drill Bit Core Drill Bit Core Drill up to 400. The description of this item has been automatically translated. 10mm professional matrix roof segments. Sample pictures drill crown 92 mm diameter. Core drilling crown matrix with connection 1¼ UNC, user length 450 mm. Suitable for concrete with strong reinforcement and hard additives, hard natural stone. Super premium diamond drilling crown with a 10 mm matrix roof segment. Specially developed for concrete, drilling & sawing service. Best performance in Allen types of concrete (also in blueeton). Extremely high speed and excellent free cut properties in very hard concrete and stone. Consistently high diamond concentration (matrix technology). The invoice with VAT. The desired invoice address must in turn check or be corrected. Each program of us is always an invoice with VAT.