hole tool body main fluid bores 23 also intersect bores into blades 11 12 and main fluid blade bores 22 whereby fluid can travel into and through blades 11 12 and expel out blade fluid ports 20 which assist the bore hole tool opening the blades 11 12 are free to move on their pin or bearing axis near the top of the bore hole tool whereby rotation of the drill string allows centrifugal force to also assist opening of the bore hole tool blades 11 12 when the bore hole tool is in a non operating mode retraction of the blades 11 12 back into the bore hole tool body 10 is caused by cessation of pumping fluid and cessation of rotation of the drill string whereby gravity causes the blades to close by gravity in a vertical well bore in an angled or horizontal well bore closure of the blades 11 12 is assisted by one or more slow rotations of the drill string whereby gravity cause the blades 11 12 to retract into the body 10 the blades remain in a closed or retracted position by one or more magnets 13 16 which are placed in the magnet openings 14 17 in the body 10 this is especially helpful when the bore hole tool is working in an angled or horizontal well bore where gravity would otherwise pull the blade able to rotate downward to an open position whereby it may catch the side wall of the well bore the magnets 13 16 could also be positioned in the blades 11 12 rather than the body 10 with the same result of blade retention the magnets 13 16 are retained in the magnet openings 14 17 by encasement material 15 18 being an.