We have a fairly large patio coming up that will be done in 16x24 and 16 x 16 slabs. On this job we have 5 downspouts that we will need to work around. I want to have a very neat cut around these. We will be cutting the downspouts above the patio floor and runnin them into sch 40 pvc, so the actual cut will be around 4" PVC so it will be a circualar cut. Anybody ever heard of a 5' masonry holesaw bit? Or any other suggestion?