Dri Vacuum Drill Bits™ DRI-8 optimal for coring block
Dri Vacuum Drill Bits™ have a large threaded adapter with 1-1/4″7 threads/inch for maximum size vacuum hole. Non-slotted tube design to ensure suction at the cutting tip of the drill bit. Reduced core travel length (10″) for easier start-up and low side run-out.