... : 4'' 4.5'' 5'' 7'' 3.Long life,high efficiency Concrete grinding PCD/PDC platePDC/PCD cutter,0804,0808,1004,1008 ... designed for the restoration or maintenance of granite and marble,concrete floors. Diameter Segment SizePCD segment NO.Bore Size/Hole size4 inch ... inch1/3φ13x8mm 3T+3TCT7 inch1/3φ13x8mm 6T+3TCT concrete grinding