... . please contact for details This package includes ;3 core drilling machines 20 core drill bits 1 extension barVacuum base and pumpHose, Allen keys ... hole.Capable of drilling holes from 8mm ~102mm. 4. 20 diamond core drill bits .20,22,24,28,50,63,76,102mm , suitable ... machines are of excellent quality. We keep a range of core bits and spares in stock. To offer you a great back ...