Dry Diamond Core Drill Bits Multipurpose Brick Block Masonry Heavy Duty Threaded. ARBOR SIZE - 5/8-11 threaded arbor. MULTIPURPOSE - designed to drill soft brick and building block.
GRIT SIZE - #30/40 grit size. HEAVY DUTY - embedded diamond concentration guarantees longer core life and efficient drilling. DRILLING DEPTH - 9.5 drilling depth. We stand behind our products. We are always happy to help. Your satisfaction is very important to us! We are a small family-owned business trying to make it, not a huge company that doesn't care... We will ALWAYS do our best for you!Thank you again for your business! We appreciate you & look forward to serving you again soon!