I need to bore a 1-1/2" dia. hole through a 2 or 3 chamber concrete block (not a cinder block) to place an outdoor electrical conduit through an outside wall. I have a conventional drill and a Skill Hammer drill. Can I buy a bit that will cut a nice hole without risk of cracking the block?
I don't want to use a star drill and hammer as I fear the block may crack or the mortar may be damaged in the process plus the hole will l be almost at floor level on one side.