A rotary drill tool for cutting rock comprising: a main body having an internal fluid supply passageway; a spindle projecting from the main body and having at least one internal fluid distribution passageway (302, 400) in communication with the supply passageway and extending within the spindle to allow a fluid received from the supply passageway to flow through and exit the spindle; a cone cutter having a cutter axis and rotatably mounted on the spindle via bearings (204, 205, 206), the cutter having at least one vent hole (609, 610, 611) to allow the fluid received from the distribution passageway (302, 400) to exit the tool as the cutter is rotated on the spindle; wherein the spindle comprises an annular shoulder and an end, the shoulder positioned axially between a base region of the spindle and the end; wherein the distribution passageway (302, 400) is divided into at least two distribution passageways (302, 400), a first distribution passageway exiting the spindle substantially at the shoulder and a second distribution passageway exiting the spindle substantially at the end; wherein the bearings (204, 205, 206) comprise: a first set of roller bearings mounted at or towards the base region; a second set of roller bearings mounted at or towards the end of the spindle; and a set of ball bearings mounted axially between the first and second set of roller bearings; wherein the first passageway exits the spindle axially between the set of ball bearings and the second set of roller bearings; wherein the cutter has an internal cavity to receive the spindle and the bearings (204, 205, 206), the cavity defined axially by: a base section to accommodate the first set of roller bearings; an intermediate section to accommodate the set of ball bearings and an end section to accommodate the second set of roller bearings, the end section being terminated by a concave or domed shaped surface; wherein at least a first one of the at least one vent hole extends through the cutter at a position closest to the end section and at least a second one of the at least one vent hole extends through the cutter at a position axially between the end and the intermediate section; characterised in that: an annular seal positioned between the base region of the spindle and the cutter to restrict fluid exiting the tool at the base region, and in that when fluid is constantly supplied to the internal fluid supply passageway, fluid is constantly exiting through all of the at least one vent holes (609, 610, 611). a main body having an internal fluid supply passageway; a spindle projecting from the main body and having at least one internal fluid distribution passageway (302, 400) in communication with the supply passageway and extending within the spindle to allow a fluid received from the supply passageway to flow through and exit the spindle; a cone cutter having a cutter axis and rotatably mounted on the spindle via bearings (204, 205, 206), the cutter having at least one vent hole (609, 610, 611) to allow the fluid received from the distribution passageway (302, 400) to exit the tool as the cutter is rotated on the spindle; wherein the spindle comprises an annular shoulder and an end, the shoulder positioned axially between a base region of the spindle and the end; wherein the distribution passageway (302, 400) is divided into at least two distribution passageways (302, 400), a first distribution passageway exiting the spindle substantially at the shoulder and a second distribution passageway exiting the spindle substantially at the end; wherein the bearings (204, 205, 206) comprise: a first set of roller bearings mounted at or towards the base region; a second set of roller bearings mounted at or towards the end of the spindle; and a set of ball bearings mounted axially between the first and second set of roller bearings; wherein the first passageway exits the spindle axially between the set of ball bearings and the second set of roller bearings; wherein the cutter has an internal cavity to receive the spindle and the bearings (204, 205, 206), the cavity defined axially by: a base section to accommodate the first set of roller bearings; an intermediate section to accommodate the set of ball bearings and an end section to accommodate the second set of roller bearings, the end section being terminated by a concave or domed shaped surface; wherein at least a first one of the at least one vent hole extends through the cutter at a position closest to the end section and at least a second one of the at least one vent hole extends through the cutter at a position axially between the end and the intermediate section; characterised in that: an annular seal positioned between the base region of the spindle and the cutter to restrict fluid exiting the tool at the base region, and in that when fluid is constantly supplied to the internal fluid supply passageway, fluid is constantly exiting through all of the at least one vent holes (609, 610, 611). an annular seal positioned between the base region of the spindle and the cutter to restrict fluid exiting the tool at the base region, and in that when fluid is constantly supplied to the internal fluid supply passageway, fluid is constantly exiting through all of the at least one vent holes (609, 610, 611).