Ball Head Driver - Small.390" ID Pilot Bore Tool Tip Holders Sold Seaperatly Ball Head StyleDiameter .390” (9.91mm) For Sunnen Pilots Uses tip holders, NWN2000, NWN2001 &NWN2002Ball Head Driver - BH-390F (Sunnen)SKU: S+G-BH-390F$300.00PriceOut of Stock