I'd like to know about this source for a 13/16 x 2-1/4 Countersink (do you really mean counter bore?) bit. I could have used one of them for laying my 7x7 sills. I counterbored to a 4 inch depth with a 2" Forstner and then switched to a 7/8" paddle bit to make the holes that accept my threaded-rod sill ties. One tool to accomplish this job would be nice.