... , electricians, builders, fencing contractors, pest control industry, air condition core drilling machinesAll the gear that you need to start your own ... contact for details This package includes ;3 core drilling machines 20 core drill bits 1 extension barVacuum base and pumpHose, Allen keys ... have an anchor hole.Capable of drilling holes from 8mm ~102mm. 4. 20 diamond core drill bits .20,22,24,28,50 ...