I got a 3/4 jet head from my buddy to use on drilling holes for putting in railing on a balcony after cement repairs were complete. This jet heat cut like butter and the wall anchors went in perfect and tightened solid. The balcony was perfect. The other bit I had not a driltec is now a bottom of the pile. I have completed half the building in better time than I thought and will now use this these bits to make my job easier. Thank you Driltec for a true round cutter. Paul Canada I can order the rest of my bits with confidence..