MILWAUKEE, 12 in Overall Lg, For 5/8"-11 Core Dia, Core Bit Extension - 45KN97|48-17-6012 - Grainger
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1PC Diamond Core Bit Extension For M22 Thread Extension Rod For Diamond Drill (Length 160mm, 200mm, 230mm, 300mm, 400mm,500mm),1pc 160mm : Amazon.co.uk: DIY & Tools
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