Rock Bits|4″ Diameter – Rock – W/2″ Hex|6″ Diameter – Rock – W/2″ Hex|9″ Diameter – Rock – W/2″ Hex|12″ Diameter – Rock – W/2″ Hex|16″ Diameter – Rock – W/2″ Hex|18″ Diameter – Rock – W/2″ Hex|24″ Diameter – Rock – W/2″ Hex|30″ Diameter – Rock – W/2″ Hex|

Powerful Drilling for Solid Surfaces: 3000 lbs. Minimum Down Pressure, Cast Tooth Pockets, Carbide Bullet Teeth, and Thick Boring Head - Not Suitable for Dirt.REQUIRES MINIMUM DOWN PRESSURE OF 3000 LBS TO WORK WELLSolid rock and concreteCast tooth pocketsD