... Or anyone how needs holes cut in concrete or masonry. advantages 1. One general purpose core drilling machine, drills holes 8mm~200mm ... 8mm ~102mm. 4. 20 diamond core drill bits .20,22,24,28,50,63,76,102mm , suitable for the small core drill machine. Can also ... = new AE.run.minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); concrete or stone diamond core drilling machines