1 1/4 – 7 UNC Thread. Run Wet or Dry. Double Tensioned (Most on market are single tensioned). NewHighest Grade MBS 960 XL Grade Synthetic Diamonds. Don’t be fooled by cheaper priced core bits these have ultra long hole life & built up to 9001 & 9002 ISO quality standards. What can I cut with this core bit? . Brick (w/ Iron Pigment).