3 – 4 or 6 short (for clay) or long (for sand) wing drill bits with a 3”1/2 NW6R or a 4”1/2 NW6R connection (other connections are available on request) are availeble at Agiva international. Larger diameters can be provided with a stabilizer ring. AGIVA carries a selection of our own quality standard and the heavy duty standard equipment, especially for those who want that a little more out of their drilling experience.